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Yes, lagfix 4 changes that significantly.
This is the end of the line for Viper4G 2.0.2.
After this comes ViperROM, a JellyBean with as many fixes as available moving forward, but no tweaks.
After that comes Viper4G 3, with tweaks.

Have NO CLUE if this was the type of "lag" that was supposed to be helped or not and just coincidental to my problem but that's when I seemed to notice it. Otherwise, haven't done much to my phone to have caused this to happen...

Assuming that you flashed Viper4G with #Fapple and lagfix 4 all in the same session, then your lag is because your contacts are being dumped from memory.
Try Autokiller Memory Optimizer.
AutoKiller Memory Optimizer - AndRS Studio
No no.
Lagfix 4 does not work if you install it later.
HTC software base 2.13 came out with a new bug, that all Sense roms inherited and had to be addressed in various ways by various devs. The contacts database grows for no reason and gets dumped from memory.
So, you missed out on the clean slate before installing lagfix 4 so now you have to fix it.
It's not hard, but it's not optional.
Go to app manager, clear data on Contacts. Immediately boot to recovery and clear cache and Dalvik.
Don't flash other fixes or try that app.
Monitor and see if lag returns.

No no.
Lagfix 4 does not work if you install it later.
HTC software base 2.13 came out with a new bug, that all Sense roms inherited and had to be addressed in various ways by various devs. The contacts database grows for no reason and gets dumped from memory.
So, you missed out on the clean slate before installing lagfix 4 so now you have to fix it.
It's not hard, but it's not optional.
Go to app manager, clear data on Contacts. Immediately boot to recovery and clear cache and Dalvik.
Don't flash other fixes or try that app.
Monitor and see if lag returns.
HTC uses a sqlite3 based database for contacts.
Anything that touches contacts get smacked by the bug - sms, MMS, mail, dialer, People, and probably a few others.![]()


How long before the lag returned?
Clear contacts again, reboot within half of the lag return time.
Some susceptible to it are ok with a reboot every two days for example.