Welcome to the community first of all. Have a good Time.
If you see fps drops write a bug report in detail at best what skill are making you drop frames and get more specific on your hardware with manufacturer for example. After you wrote said post you can take a look if you have the latest drivers for your hardware just to make sure it’s the case. Alternitively you can do it the other way arround .
It’s not fps drop, its just some skills look like they are running at very low frame rate. I will upload a video clip here. You can check the real-time FPS on top-left, and you shall see the skill effect around the character.