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I forced e10s on 47, and it's still enabled in 48. In both I see random beachballs (OS X) hitting refresh in one tab and moving to another, and sometimes spinning wheels trying to navigate to a new tab.

I don't think there are any real performance improvements in 48 other than the improvement you'll get from restarting a long running process.

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Have you tried with addons disabled? Your experience with E10s largely revolves around which addons you're using.

Some addons use compatibility shims with multi-process and this can significantly harm performance in some cases (even potentially making it worse than e10s disabled).

This site is useful regarding the addon compatibility: http://arewee10syet.com/

I tried it on 49 Dev. Seemed to work nice and much faster than 47 when I was quickly testing. But this was just a quick impression.

Unfortunately I couldn't use my addons with it and together with the constant updates it was a no go for me.

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