The plugin was built for older versions of Skyrim Special Edition (pre-1.6.629) and fails to load on newer AE builds.
This file is part of vanilla Skyrim. It belongs to third-party mods or ENB/ReShade presets that modify frame rendering, anti-aliasing, or post-processing. The name suggests it’s related to maxing out frame buffers or ultra-frame rendering – often from: skyrim maxsulframe.dll error