Riften is the 32-bit engine's nemesis. Disable high-resolution textures for the "RiftenFoliage" static object. Use Riften Performance Boost from Nexus.
Between 2011 and 2016, the modding community produced tens of thousands of mods for the original engine. While many popular mods have been ported to Special Edition, a vast number of unique, niche, and highly complex mods remain exclusive to Oldrim. If you want to play with specific legacy armors, older quest mods that were never ported, or the original versions of classic overhauls, 1.9.32 is the only option. Skyrim 1.9.32 Mods
However, a specific version of this original game remains a sacred ground for modders: Riften is the 32-bit engine's nemesis