Stingers makes CPU spikes on OBS

Hello everyone!

Since two weeks ago I'm having some problem with OBS.
I have custom stingers for my streaming, I made them with AE as .webm

Everything was fine I even add different variations of that stinger with different colours.

Then, one day, during my streaming every time I went from one scene to another I got a huge spike of the CPU (30/40%) and I wasn't playing anything, just chatting.

I tought it could be some problem on my PC, so after a few attempts I formatted my PC.

After that I (obviously) re-installed OBS and even just with one stinger (.webm) it's making the same issue.

Why? Before it was fine then out of nowhere is having issues.

Plus, I use an animated banner/bumpers (now I'm using them with browser source via StreamElements) that appears often during my streaming (made by myself on AE) what do you suggest? .webm? .avi? something else?

To be clear, If I remove the stinger it works fine but I want my personal stingers and not just the simple fade.

Thanks to anyone who's gonna help me!
 
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