The pages load and scroll relatively normally for me, without any animated images on them.
I use adblockplus to block loading of various images, including all the animated stuff, because it is extremely distracting (I can get stuck for minutes to hours staring at one, unable to completely break away, or drawn repeatedly back to it and unable to concentrate on anything else on the page, depending on what it is and it's rate of motion).
I do sometimes have my scroll get "stuck" where i actually have to go to the right hand scrollbar and drag it a bit and then the trackball wheel will scroll again. (this doesn't happen except on ES pages, and only since the upgrade, not anywhere else on the same computer, so it isn't dog hair in the wheel
cuz that's what I thought it was to start with, and disassembled and cleaned the trackball). It's pretty intermittent, so I haven't found a direct relation between it happening and any particular thing that is on the page at that time. I had thought it was large images, but its happened on a page without any in view at the time at least once, so I don't think that's it.
I figured it's probably something specific with my browser and the things I have blocked from loading or displaying (ABP and RIP), but maybe it isn't?
The computer itself is fast enough (icore5-6200U 8gb ram) after I hacked out a bunch of win10 crap that caused it to repeatedly pause and make me wait to do anything, and generally made it unbearable (it's still a crappy OS but XP won't run on it; no drivers).