I have the same issue, but only on one of my devices. All three use Chrome. My mobile should be the one with the worst connection, yet my home laptop is the one that I have to double-click on.
I just assume that I have no bandwidth at those times because of a game my mom plays... (20+ games of Yahtzee going, each one checking for updates every few seconds... It kills the bandwidth, obviously. This is why the rest of the family constantly fusses at her about playing it. Though she does disconnect the device from the internet for most of the day, now.)
So, maybe your issue is similar to mine? (It only slows down a few of the sites I'm on, so it might not be overly noticeable all the time.)