diff --git a/frappe/__init__.py b/frappe/__init__.py
index 08c0f794b3..a8bf114b9b 100644
--- a/frappe/__init__.py
+++ b/frappe/__init__.py
@@ -12,6 +12,8 @@ Read the documentation: https://frappeframework.com/docs
 """
 import os, warnings
 
+STANDARD_USERS = ('Guest', 'Administrator')
+
 _dev_server = os.environ.get('DEV_SERVER', False)
 
 if _dev_server:
@@ -121,6 +123,7 @@ def set_user_lang(user, user_language=None):
 	local.lang = get_user_lang(user)
 
 # local-globals
+
 db = local("db")
 qb = local("qb")
 conf = local("conf")
diff --git a/frappe/auth.py b/frappe/auth.py
index 078a6bb165..a87edb6460 100644
--- a/frappe/auth.py
+++ b/frappe/auth.py
@@ -250,8 +250,7 @@ class LoginManager:
 		if not self.user:
 			return
 
-		from frappe.core.doctype.user.user import STANDARD_USERS
-		if self.user in STANDARD_USERS:
+		if self.user in frappe.STANDARD_USERS:
 			return False
 
 		reset_pwd_after_days = cint(frappe.db.get_single_value("System Settings",
diff --git a/frappe/boot.py b/frappe/boot.py
index e671d8b37d..d5d992343a 100644
--- a/frappe/boot.py
+++ b/frappe/boot.py
@@ -17,7 +17,7 @@ from frappe.social.doctype.energy_point_log.energy_point_log import get_energy_p
 from frappe.model.base_document import get_controller
 from frappe.social.doctype.post.post import frequently_visited_links
 from frappe.core.doctype.navbar_settings.navbar_settings import get_navbar_settings, get_app_logo
-from frappe.utils import get_time_zone
+from frappe.utils import get_time_zone, add_user_info
 
 def get_bootinfo():
 	"""build and return boot info"""
@@ -222,17 +222,14 @@ def load_translations(bootinfo):
 	bootinfo["__messages"] = messages
 
 def get_user_info():
-	user_info = frappe.db.get_all('User', fields=['`name`', 'full_name as fullname', 'user_image as image', 'gender',
-		'email', 'username', 'bio', 'location', 'interest', 'banner_image', 'allowed_in_mentions', 'user_type', 'time_zone'],
-		filters=dict(enabled=1))
+	# get info for current user
+	user_info = frappe._dict()
+	add_user_info(frappe.session.user, user_info)
 
-	user_info_map = {d.name: d for d in user_info}
+	if frappe.session.user == 'Administrator' and user_info.Administrator.email:
+		user_info[user_info.Administrator.email] = user_info.Administrator
 
-	admin_data = user_info_map.get('Administrator')
-	if admin_data:
-		user_info_map[admin_data.email] = admin_data
-
-	return user_info_map
+	return user_info
 
 def get_user(bootinfo):
 	"""get user info"""
diff --git a/frappe/core/doctype/user/user.py b/frappe/core/doctype/user/user.py
index ef7845d3b0..b674ea6891 100644
--- a/frappe/core/doctype/user/user.py
+++ b/frappe/core/doctype/user/user.py
@@ -19,7 +19,7 @@ from frappe.core.doctype.user_type.user_type import user_linked_with_permission_
 from frappe.query_builder import DocType
 
 
-STANDARD_USERS = ("Guest", "Administrator")
+STANDARD_USERS = frappe.STANDARD_USERS
 
 class User(Document):
 	__new_password = None
diff --git a/frappe/desk/form/load.py b/frappe/desk/form/load.py
index 0e644c3cf5..38b671d629 100644
--- a/frappe/desk/form/load.py
+++ b/frappe/desk/form/load.py
@@ -94,30 +94,78 @@ def get_docinfo(doc=None, doctype=None, name=None):
 	automated_messages = filter(lambda x: x['communication_type'] == 'Automated Message', all_communications)
 	communications_except_auto_messages = filter(lambda x: x['communication_type'] != 'Automated Message', all_communications)
 
-	frappe.response["docinfo"] = {
+	docinfo = frappe._dict(user_info = {})
+
+	add_comments(doc, docinfo)
+
+	docinfo.update({
 		"attachments": get_attachments(doc.doctype, doc.name),
-		"attachment_logs": get_comments(doc.doctype, doc.name, 'attachment'),
 		"communications": communications_except_auto_messages,
 		"automated_messages": automated_messages,
-		'comments': get_comments(doc.doctype, doc.name),
 		'total_comments': len(json.loads(doc.get('_comments') or '[]')),
 		'versions': get_versions(doc),
 		"assignments": get_assignments(doc.doctype, doc.name),
-		"assignment_logs": get_comments(doc.doctype, doc.name, 'assignment'),
 		"permissions": get_doc_permissions(doc),
 		"shared": frappe.share.get_users(doc.doctype, doc.name),
-		"info_logs": get_comments(doc.doctype, doc.name, comment_type=['Info', 'Edit', 'Label']),
-		"share_logs": get_comments(doc.doctype, doc.name, 'share'),
-		"like_logs": get_comments(doc.doctype, doc.name, 'Like'),
-		"workflow_logs": get_comments(doc.doctype, doc.name, comment_type="Workflow"),
 		"views": get_view_logs(doc.doctype, doc.name),
 		"energy_point_logs": get_point_logs(doc.doctype, doc.name),
 		"additional_timeline_content": get_additional_timeline_content(doc.doctype, doc.name),
 		"milestones": get_milestones(doc.doctype, doc.name),
 		"is_document_followed": is_document_followed(doc.doctype, doc.name, frappe.session.user),
 		"tags": get_tags(doc.doctype, doc.name),
-		"document_email": get_document_email(doc.doctype, doc.name)
-	}
+		"document_email": get_document_email(doc.doctype, doc.name),
+	})
+
+	update_user_info(docinfo)
+
+	frappe.response["docinfo"] = docinfo
+
+def add_comments(doc, docinfo):
+	# divide comments into separate lists
+	docinfo.comments = []
+	docinfo.shared = []
+	docinfo.assignment_logs = []
+	docinfo.attachment_logs = []
+	docinfo.info_logs = []
+	docinfo.like_logs = []
+	docinfo.workflow_logs = []
+
+	comments = frappe.get_all("Comment",
+		fields=["name", "creation", "content", "owner", "comment_type"],
+		filters={
+			"reference_doctype": doc.doctype,
+			"reference_name": doc.name
+		}
+	)
+
+	for c in comments:
+		if c.comment_type == "Comment":
+			c.content = frappe.utils.markdown(c.content)
+			docinfo.comments.append(c)
+
+		elif c.comment_type in ('Shared', 'Unshared'):
+			docinfo.shared.append(c)
+
+		elif c.comment_type in ('Assignment Completed', 'Assigned'):
+			docinfo.assignment_logs.append(c)
+
+		elif c.comment_type in ('Attachment', 'Attachment Removed'):
+			docinfo.attachment_logs.append(c)
+
+		elif c.comment_type in ('Info', 'Edit', 'Label'):
+			docinfo.info_logs.append(c)
+
+		elif c.comment_type == "Like":
+			docinfo.like_logs.append(c)
+
+		elif c.comment_type == "Workflow":
+			docinfo.workflow_logs.append(c)
+
+		frappe.utils.add_user_info(c.owner, docinfo.user_info)
+
+
+	return comments
+
 
 def get_milestones(doctype, name):
 	return frappe.db.get_all('Milestone', fields = ['creation', 'owner', 'track_field', 'value'],
@@ -252,7 +300,7 @@ def get_communication_data(doctype, name, start=0, limit=20, after=None, fields=
 	return communications
 
 def get_assignments(dt, dn):
-	cl = frappe.get_all("ToDo",
+	return frappe.get_all("ToDo",
 		fields=['name', 'allocated_to as owner', 'description', 'status'],
 		filters={
 			'reference_type': dt,
@@ -260,8 +308,6 @@ def get_assignments(dt, dn):
 			'status': ('!=', 'Cancelled'),
 		})
 
-	return cl
-
 @frappe.whitelist()
 def get_badge_info(doctypes, filters):
 	filters = json.loads(filters)
@@ -319,3 +365,24 @@ def get_additional_timeline_content(doctype, docname):
 		contents.extend(frappe.get_attr(method)(doctype, docname) or [])
 
 	return contents
+
+def update_user_info(docinfo):
+	for d in docinfo.communications:
+		frappe.utils.add_user_info(d.sender, docinfo.user_info)
+
+	for d in docinfo.shared:
+		frappe.utils.add_user_info(d.user, docinfo.user_info)
+
+	for d in docinfo.assignments:
+		frappe.utils.add_user_info(d.owner, docinfo.user_info)
+
+	for d in docinfo.views:
+		frappe.utils.add_user_info(d.owner, docinfo.user_info)
+
+@frappe.whitelist()
+def get_user_info_for_viewers(users):
+	user_info = {}
+	for user in json.loads(users):
+		frappe.utils.add_user_info(user, user_info)
+
+	return user_info
diff --git a/frappe/desk/reportview.py b/frappe/desk/reportview.py
index fb150e4bea..e81ed0767b 100644
--- a/frappe/desk/reportview.py
+++ b/frappe/desk/reportview.py
@@ -12,7 +12,7 @@ from io import StringIO
 from frappe.core.doctype.access_log.access_log import make_access_log
 from frappe.utils import cstr, format_duration
 from frappe.model.base_document import get_controller
-
+from frappe.utils import add_user_info
 
 @frappe.whitelist()
 @frappe.read_only()
@@ -219,6 +219,8 @@ def compress(data, args=None):
 	"""separate keys and values"""
 	from frappe.desk.query_report import add_total_row
 
+	user_info = {}
+
 	if not data: return data
 	if args is None:
 		args = {}
@@ -230,13 +232,19 @@ def compress(data, args=None):
 			new_row.append(row.get(key))
 		values.append(new_row)
 
+		# add user info for assignments (avatar)
+		if row._assign:
+			for user in json.loads(row._assign):
+				add_user_info(user, user_info)
+
 	if args.get("add_total_row"):
 		meta = frappe.get_meta(args.doctype)
 		values = add_total_row(values, keys, meta)
 
 	return {
 		"keys": keys,
-		"values": values
+		"values": values,
+		"user_info": user_info
 	}
 
 @frappe.whitelist()
diff --git a/frappe/model/base_document.py b/frappe/model/base_document.py
index 26a4658c36..631174b4db 100644
--- a/frappe/model/base_document.py
+++ b/frappe/model/base_document.py
@@ -646,8 +646,6 @@ class BaseDocument(object):
 					value, comma_options))
 
 	def _validate_data_fields(self):
-		from frappe.core.doctype.user.user import STANDARD_USERS
-
 		# data_field options defined in frappe.model.data_field_options
 		for data_field in self.meta.get_data_fields():
 			data = self.get(data_field.fieldname)
@@ -658,7 +656,7 @@ class BaseDocument(object):
 				continue
 
 			if data_field_options == "Email":
-				if (self.owner in STANDARD_USERS) and (data in STANDARD_USERS):
+				if (self.owner in frappe.STANDARD_USERS) and (data in frappe.STANDARD_USERS):
 					continue
 				for email_address in frappe.utils.split_emails(data):
 					frappe.utils.validate_email_address(email_address, throw=True)
diff --git a/frappe/public/js/frappe/form/form_viewers.js b/frappe/public/js/frappe/form/form_viewers.js
index 964576ef8a..ecf5eea504 100644
--- a/frappe/public/js/frappe/form/form_viewers.js
+++ b/frappe/public/js/frappe/form/form_viewers.js
@@ -27,19 +27,40 @@ frappe.ui.form.FormViewers.set_users = function(data, type) {
 	const users = data.users || [];
 	const new_users = users.filter(user => !past_users.includes(user));
 
-	frappe.model.set_docinfo(doctype, docname, type, {
-		past: past_users.concat(new_users),
-		new: new_users,
-		current: users
-	});
-
-	if (
-		cur_frm &&
-		cur_frm.doc &&
-		cur_frm.doc.doctype === doctype &&
-		cur_frm.doc.name == docname &&
-		cur_frm.viewers
-	) {
-		cur_frm.viewers.refresh(true, type);
+	if (new_users.length===0) return;
+
+	const set_and_refresh = () => {
+		const info = {
+			past: past_users.concat(new_users),
+			new: new_users,
+			current: users
+		};
+
+		frappe.model.set_docinfo(doctype, docname, type, info);
+
+		if (
+			cur_frm &&
+			cur_frm.doc &&
+			cur_frm.doc.doctype === doctype &&
+			cur_frm.doc.name == docname &&
+			cur_frm.viewers
+		) {
+			cur_frm.viewers.refresh(true, type);
+		}
+	};
+
+	let unknown_users = [];
+	for (let user of users) {
+		if (!frappe.boot.user_info[user]) unknown_users.push(user);
+	}
+
+	if (unknown_users.length===0) {
+		set_and_refresh();
+	} else {
+		// load additional user info
+		frappe.xcall('frappe.desk.form.load.get_user_info_for_viewers', {users: unknown_users}).then((data) => {
+			Object.assign(frappe.boot.user_info, data);
+			set_and_refresh();
+		});
 	}
 };
diff --git a/frappe/public/js/frappe/list/base_list.js b/frappe/public/js/frappe/list/base_list.js
index aa1101c64e..8fa512bfc0 100644
--- a/frappe/public/js/frappe/list/base_list.js
+++ b/frappe/public/js/frappe/list/base_list.js
@@ -484,6 +484,11 @@ frappe.views.BaseList = class BaseList {
 
 	prepare_data(r) {
 		let data = r.message || {};
+
+		// extract user_info for assignments
+		Object.assign(frappe.boot.user_info, data.user_info);
+		delete data.user_info;
+
 		data = !Array.isArray(data)
 			? frappe.utils.dict(data.keys, data.values)
 			: data;
diff --git a/frappe/public/js/frappe/model/sync.js b/frappe/public/js/frappe/model/sync.js
index 753046fa13..2cb7ca1a32 100644
--- a/frappe/public/js/frappe/model/sync.js
+++ b/frappe/public/js/frappe/model/sync.js
@@ -1,7 +1,7 @@
 // Copyright (c) 2015, Frappe Technologies Pvt. Ltd. and Contributors
 // MIT License. See license.txt
 
-$.extend(frappe.model, {
+Object.assign(frappe.model, {
 	docinfo: {},
 	sync: function(r) {
 		/* docs:
@@ -33,22 +33,28 @@ $.extend(frappe.model, {
 				}
 
 				if(d.localname) {
-					frappe.model.new_names[d.localname] = d.name;
-					$(document).trigger('rename', [d.doctype, d.localname, d.name]);
-					delete locals[d.doctype][d.localname];
-
-					// update docinfo to new dict keys
-					if(i===0) {
-						frappe.model.docinfo[d.doctype][d.name] = frappe.model.docinfo[d.doctype][d.localname];
-						frappe.model.docinfo[d.doctype][d.localname] = undefined;
-					}
+					frappe.model.rename_after_save(d, i);
 				}
 			}
+		}
 
+		frappe.model.sync_docinfo(r);
+
+	},
 
+	rename_after_save: (d, i) => {
+		frappe.model.new_names[d.localname] = d.name;
+		$(document).trigger('rename', [d.doctype, d.localname, d.name]);
+		delete locals[d.doctype][d.localname];
 
+		// update docinfo to new dict keys
+		if(i===0) {
+			frappe.model.docinfo[d.doctype][d.name] = frappe.model.docinfo[d.doctype][d.localname];
+			frappe.model.docinfo[d.doctype][d.localname] = undefined;
 		}
+	},
 
+	sync_docinfo: (r) => {
 		// set docinfo (comments, assign, attachments)
 		if(r.docinfo) {
 			var doc;
@@ -62,10 +68,14 @@ $.extend(frappe.model, {
 					frappe.model.docinfo[doc.doctype] = {};
 				frappe.model.docinfo[doc.doctype][doc.name] = r.docinfo;
 			}
+
+			// copy values to frappe.boot.user_info
+			Object.assign(frappe.boot.user_info, r.docinfo.user_info);
 		}
 
 		return r.docs;
 	},
+
 	add_to_locals: function(doc) {
 		if(!locals[doc.doctype])
 			locals[doc.doctype] = {};
@@ -100,6 +110,7 @@ $.extend(frappe.model, {
 			}
 		}
 	},
+
 	update_in_locals: function(doc) {
 		// update values in the existing local doc instead of replacing
 		let local_doc = locals[doc.doctype][doc.name];
diff --git a/frappe/public/js/frappe/utils/user.js b/frappe/public/js/frappe/utils/user.js
index f22611b515..a5a7801cc1 100644
--- a/frappe/public/js/frappe/utils/user.js
+++ b/frappe/public/js/frappe/utils/user.js
@@ -2,14 +2,6 @@ frappe.user_info = function(uid) {
 	if(!uid)
 		uid = frappe.session.user;
 
-	if(uid.toLowerCase()==="bot") {
-		return {
-			fullname: __("Bot"),
-			image: "/assets/frappe/images/ui/bot.png",
-			abbr: "B"
-		};
-	}
-
 	if(!(frappe.boot.user_info && frappe.boot.user_info[uid])) {
 		var user_info = {fullname: uid || "Unknown"};
 	} else {
@@ -22,29 +14,6 @@ frappe.user_info = function(uid) {
 	return user_info;
 };
 
-frappe.ui.set_user_background = function(src, selector, style) {
-	if(!selector) selector = "#page-desktop";
-	if(!style) style = "Fill Screen";
-	if(src) {
-		if (window.cordova && src.indexOf("http") === -1) {
-			src = frappe.base_url + src;
-		}
-		var background = repl('background: url("%(src)s") center center;', {src: src});
-	} else {
-		var background = "background-color: #4B4C9D;";
-	}
-
-	frappe.dom.set_style(repl('%(selector)s { \
-		%(background)s \
-		background-attachment: fixed; \
-		%(style)s \
-	}', {
-		selector:selector,
-		background:background,
-		style: style==="Fill Screen" ? "background-size: cover;" : ""
-	}));
-};
-
 frappe.provide('frappe.user');
 
 $.extend(frappe.user, {
diff --git a/frappe/utils/__init__.py b/frappe/utils/__init__.py
index ffff7032aa..54a6f0b7e8 100644
--- a/frappe/utils/__init__.py
+++ b/frappe/utils/__init__.py
@@ -56,7 +56,7 @@ def get_email_address(user=None):
 def get_formatted_email(user, mail=None):
 	"""get Email Address of user formatted as: `John Doe <johndoe@example.com>`"""
 	fullname = get_fullname(user)
-	
+
 	method = get_hook_method('get_sender_details')
 	if method:
 		sender_name, mail = method()
@@ -623,12 +623,11 @@ def get_installed_apps_info():
 	return out
 
 def get_site_info():
-	from frappe.core.doctype.user.user import STANDARD_USERS
 	from frappe.email.queue import get_emails_sent_this_month
 	from frappe.utils.user import get_system_managers
 
 	# only get system users
-	users = frappe.get_all('User', filters={'user_type': 'System User', 'name': ('not in', STANDARD_USERS)},
+	users = frappe.get_all('User', filters={'user_type': 'System User', 'name': ('not in', frappe.STANDARD_USERS)},
 		fields=['name', 'enabled', 'last_login', 'last_active', 'language', 'time_zone'])
 	system_managers = get_system_managers(only_name=True)
 	for u in users:
@@ -898,3 +897,14 @@ def dictify(arg):
 		arg = frappe._dict(arg)
 
 	return arg
+
+def add_user_info(user, user_info):
+	if user not in user_info:
+		info = frappe.db.get_value("User",
+			user, ["full_name", "user_image", "name", 'email'], as_dict=True) or frappe._dict()
+		user_info[user] = frappe._dict(
+			fullname = info.full_name or user,
+			image = info.user_image,
+			name = user,
+			email = info.email
+		)
diff --git a/frappe/utils/scheduler.py b/frappe/utils/scheduler.py
index 43580c1287..8ebb4b2937 100755
--- a/frappe/utils/scheduler.py
+++ b/frappe/utils/scheduler.py
@@ -17,7 +17,6 @@ import schedule
 
 # imports - module imports
 import frappe
-from frappe.core.doctype.user.user import STANDARD_USERS
 from frappe.installer import update_site_config
 from frappe.utils import get_sites, now_datetime
 from frappe.utils.background_jobs import get_jobs
diff --git a/frappe/utils/user.py b/frappe/utils/user.py
index e5acb53daf..cbf38f6acb 100755
--- a/frappe/utils/user.py
+++ b/frappe/utils/user.py
@@ -230,7 +230,6 @@ def get_fullname_and_avatar(user):
 def get_system_managers(only_name=False):
 	"""returns all system manager's user details"""
 	import email.utils
-	from frappe.core.doctype.user.user import STANDARD_USERS
 	system_managers = frappe.db.sql("""SELECT DISTINCT `name`, `creation`,
 		CONCAT_WS(' ',
 			CASE WHEN `first_name`= '' THEN NULL ELSE `first_name` END,
@@ -245,8 +244,8 @@ def get_system_managers(only_name=False):
 				FROM `tabHas Role` AS ur
 				WHERE ur.parent = p.name
 				AND ur.role='System Manager')
-		ORDER BY `creation` DESC""".format(", ".join(["%s"]*len(STANDARD_USERS))),
-			STANDARD_USERS, as_dict=True)
+		ORDER BY `creation` DESC""".format(", ".join(["%s"]*len(frappe.STANDARD_USERS))),
+			frappe.STANDARD_USERS, as_dict=True)
 
 	if only_name:
 		return [p.name for p in system_managers]