In the last couple of days, I upgraded to the latest CSSU-Stable, as well as installed FrontCamera and FCamera apps. Is there any chance that any of these changes affected the phone app in a way that whenever I answer an incoming call, it takes 1-3 seconds before the calling party can actually hear me? (having to say hi/hello three times, that is... it used to be instantaneous, of course.)
Has anyone had similar problems with the phone app?

I get this problem with "custom ringtone for your contacts" after removing it the ringtone work normally

I don't use custom ringtones anymore. Did it only affect the contacts where you had custom ringtones defined, or all of them?

I'll see if the problem persists after a week and/or a couple reboots/shutdowns. The new CSSU is really fast compared to the previous one, so this particular issue is kind of strange.

Bump... Just because it is an important issue for those who have the misfortune of encountering it.
Best wishes.
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Per aspera ad astra...

I doubt it's custom ringtones.
I have been using that for a while with no issues.

Recaller IIRC was known to do things like you describe.

I've had Recaller since day one, and it did in fact sometimes cause issues such as ending calls slowly (or freezing the phone for a moment while ending calls), never at starting them. But that has luckily happened rarely, though.