However if SSE gets modded(Heavily), it still tends to be somewhat unstable/crash or cause lowered framerates.
Luckily, Skyrim SE is more stable in that regard,due to it being optimized for a 64-bit Version of Windows, which fixes alot of issues that were present in Oldrim such as not using more than 4 GB of RAM etc. This is due to the problem that, like many Bethesda games, Skyrim is build on the very old gamebryo engine. Skyrim is a game with many flaws, unstable framerate, stuttering, frequent crashing etc.