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Works fine for me on an average laptop with latest stable Firefox.

Try "Show All".

Seems instantaneous on Firefox for me.

Really?! It isn't instantaneous for me, even on Firefox 62 (Windows). Takes some half a second or so.

I'm on Firefox 68.0.2 on Windows 10.

I can click "Show All" and "Hide All" over and over and there is hardly any delay. Maybe you should upgrade to the latest and see if it makes a difference.

Interesting, thanks for mentioning this! It seems to be something with my profile, because a fresh profile is also definitely faster (maybe 200-300ms just eyeballing). The latest unbranded build I got [1] also seems about the same if not faster (maybe around 200ms). Definitely not "instantaneous", but I'll definitely track this down.

UPDATE: At least 3 of the culprits seem to be MutationObservers from my own extensions (as in, from extensions that I have written for myself) that have {childList: true, subtree: true}! I guess I will have to optimize them. :-)

[1] https://queue.taskcluster.net/v1/task/Uht_zkkPThu384OAHNPwdA...

200ms on Firefox clicking show all.

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