Stinger transitions lagging after adding StreamElements browser source

So I made a few stinger transitions recently for OBS and they ran fine. But then I tried Stream elements for the first time making two browser sources (one for each scene) and after putting in the second stream element source (which contains an animated screen border and an animated chatbox I made for each). the transitions starts lagging and wont perform properly. Should I even be adding in animated borders and chatboxes in the first place in Steam Elements? or is that more for alerts specifically?

also a note on rendering, I've rendered everything in Davinci Resolve with:

Format: QuickTime
Codec: GoPro Cineform
Type: RGB 16-bit
Quality: Best
1920x1080 resolution with "Export Alpha" checked

I then converted the .mov files with ffmpeg and using this cmd line:

"ffmpeg -i "sourcefilename" -c:v libvpx-vp9 -pix_fmt yuva420p "targetfilename".

Is there a better alternative rendering format to use in Davinci Resolve than this? Or will the batch file that Eposvox provided in his video do the job already with my current rendering settings?
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