Performance issue with keys() requests in Chrome

[fxi]

Hi there.

I just got a weird issue. Not reproducible... sorry.

For an unknown reason, .keys() and .iterate became very slow in my app.
I wrote a script that mimics what's happening :
https://jsfiddle.net/fxi/hg07voey/1/
There, .keys() is fast. Same browser. Different results.

What could make .keys() being slow in another context ?

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Here are timing from my app, to get keys from ~200 items of 250b.

	ms
chrome	4440.856
chrome incognito	43.587
firefox	18

Versions :

• Browser : Chrome 107.0.5304.110 (Official Build) (arm64)
• localforage : 1.10.0

I tried :

• Removing the DB
• Removing All DB
• Removing application cache ( clear site data )
• Rebooting ( you know... )

Observations :

• I don't have any extension.
• In the performance profile, I've seen that nothing is happening during those 4400ms, except loads of events from localforage ( 0ms blocking)...