For those with slow animation problems, if your CPU is AMD, then it could likely be related to CardWirth and your CPU. For whatever reason, CardWirth doesn't work well with AMD CPUs. Animations play slowly even on a 3rd-gen Ryzen desktop CPU. Meanwhile my 4 year old laptop with an Intel CPU runs it just fine.
As I mentioned over in ULMF, the solution I found was to run it on CardWirthPy instead. Download it and follow the same setup steps as CardWirth. It runs way more efficiently, playing the animations at the intended speed while having lower cpu usage.
Tl;dr If game lags and you have AMD CPU, search up "CardWirthPy" and follow the same setup steps.