Cubase is Working Slow

Hi
I have cubase 12 and it’s plays the song really slow with “lags”
When i deactivated all 3rd party plugins cubase works well,is there a why to know which plugins cause cubase 12 to work slow?
My setup:
i have Windows 10 pro 64 bit
RTX 2080 VIDEO CRAD
CPU:Intel(R) Core™ i5-9500 CPU @ 3.00GHz 3.00 GHz
Ram:32.0 GB 2400 Hz
RME baby face fs audio card .

I’m on 2048 buffer i can’t really check the buffer size inside cubase because the control room doesn’t open .
Thank you :slight_smile: