So in addition to the awesome checkerboard pattern of "I haven't loaded yet" that seems to have been implemented a few builds back, I now have tabs continuing to eat more and more memory, until they get to about 1GB, and then become really slow to load a page, or unresponsive.
Here's a screen grab of the browser task manager from a couple minutes ago:
I'm typing this post inside that tab, and even the text I'm typing is lagging and sputtering to show up in the text field as I type it. I've tried disabling all extensions, but that doesn't seem to do anything. The browser itself is a recent re-install.
I don't want to go to another browser because I like having history, tabs, passwords, extensions, etc., synced between browsers at work and home, as well as on my phone and tablet, but I'm really starting to get fed up with this shit performance.