Do you have any ideas of the cases we should use Add*VarCache?
For example, it's bad if using Get* when:
* every painting
* every mousemove
* every user input except mousemove
* every focus move
* every DOM change
* every page load
etc.
I wonder, if everybody uses Add*VarCache, doesn't it cause another
performance problem when a pref is changed?
On 2017/02/22 20:18, smaug wrote:
Hi,
Preferences::GetBool is a slow hashtable lookup and has been showing up
in performance profiles in many places.
Please use Preferences::AddBoolVarCache. Same with other pref types.
Or if the pref needs to be read just once, store the value in some
static variable or so.
-Olli
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Masayuki Nakano <masay...@d-toybox.com>
Software Engineer, Mozilla
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