Overall same Google Doc is slow on Google Chrome and fast on Safari (both browsers are up to date - Google Chrome Version 49.0.2623.110 (64-bit) and Safari Version 9.0.3 (11601.4.4)). When I try to reference a piece of text, it takes a long time for the search field to appear, search for the reference, and inserting the reference into the text. Also typing is slow in Google Chrome. Sometimes i have to switch to Safari to type faster.
I tried using fewer tabs in my browser. Even the only tab used is the one with the Google Doc and the same phenomenon occurs.
I have attempted to clear my cache and load the page again but the problem still persists.
Please let me know what more information I can provide you.