It happens with all the slice games, I can't remember if it happens with the chronos and the new popeye game as well or not.
Those slots when loaded over consume resources (not sure what causes the problem) but I also notice it.
I usually do these battles while watching some videos, mostly on youtube, and whenever I open a raw slot the youtube video just starts crashing.
My guess would be something related with their usage of the hardware acceleration.
It doesn't happen with other providers, so it's something in RAW code, Leander slots are fine as well.
And for reference, my PC isn't weak, it has 32gb ram, intel i7 11th gen and a nvidia RTX 3060