Windows 10 Professional 64-bit
Chrome 60.0.3112.90 64-bit

What steps will reproduce the problem?
(1) Create 2500 or more autofill address entries. 
(1a) To automate: exit chrome (to release database), execute python script (adjust Web Data path), 5000 records in our case:

import sqlite3;
conn=sqlite3.connect('C:/Documents and Settings/ig/Local Settings/Google/Chrome/User Data/Default/Web Data');
cursor=conn.cursor();
statement_base='INSERT INTO \"autofill_profiles\" (guid, company_name, street_address, city, state, zipcode, country_code, date_modified,origin) VALUES ';
for i in range(90000,95003):
	statement=statement_base+'(\'00000000-0000-0000-0000-0000000'+str(i)+'\',\'Google, Inc.\',\'1950 Charleston Rd.\',\'Mountain View\',\'CA\',\''+str(i)+'\',\'S\',1386046731,\'Chrome settings\')';
#	print (statement);
	cursor.execute(statement);
conn.commit();
conn.close();

(2) Launch chrome, login to chrome, wait for sync to complete. Make sure chrome://sync-internals and chrome://settings/autofill has more than 5000 autofill records.
(3) Navigate to any site with address input, e.g. https://tools.usps.com/go/ZipLookupAction_input
(4) Start typing zip code with "9"

What is the expected result?
Autofill data pops up

What happens instead?
Chrome hangs

Please use labels and text to provide additional information.
Have enterprise customer who needs to use this amount of autofill records.

Richard/autofill team can you please help to triage?
 

Windows 10 Professional 64-bit
Chrome 60.0.3112.90 64-bit

What steps will reproduce the problem?
Reproduced in MTV-QD5
(1) Create 2500 or more autofill address entries. 
(1a) To automate: exit chrome (to release database), execute python script (adjust Web Data path), 5000 records in our case:

import sqlite3;
conn=sqlite3.connect('C:/Documents and Settings/ig/Local Settings/Google/Chrome/User Data/Default/Web Data');
cursor=conn.cursor();
statement_base='INSERT INTO \"autofill_profiles\" (guid, company_name, street_address, city, state, zipcode, country_code, date_modified,origin) VALUES ';
for i in range(90000,95003):
	statement=statement_base+'(\'00000000-0000-0000-0000-0000000'+str(i)+'\',\'Google, Inc.\',\'1950 Charleston Rd.\',\'Mountain View\',\'CA\',\''+str(i)+'\',\'S\',1386046731,\'Chrome settings\')';
#	print (statement);
	cursor.execute(statement);
conn.commit();
conn.close();

(2) Launch chrome, login to chrome, wait for sync to complete. Make sure chrome://sync-internals and chrome://settings/autofill has more than 5000 autofill records.
(3) Navigate to any site with address input, e.g. https://tools.usps.com/go/ZipLookupAction_input
(4) Start typing zip code with "9"

What is the expected result?
Autofill data pops up

What happens instead?
Chrome hangs

Please use labels and text to provide additional information.
Have enterprise customer who needs to use this amount of autofill records.

Richard/autofill team can you please help to triage?