The main highlights in this version are:

Full changelog:

Removed the "nodepreview_worker" binary module (replaced with Blender API and numpy). This makes the addon more future-proof, because a new Python version in Blender will no longer require a re-compilation of the binary module. The best thing however is that you no longer need to follow special steps when updating or removing the addon. Performance also got better because of this (see below).
Added support for Float and Vector curve nodes
Improved performance for node groups with lots of links between their nodes
Improved image texture loading performance in the background process (e.g. from 3s to 0.6s loading time for a giant 40 megapixel image)
Improved render result loading performance in the background process
Added support for Raw and Non-Color colorspaces of image textures
Fixed addon not working if another addon registers a buggy class
Fixed a text rendering problem in Blender 4.0 beta caused by a change in the Blender API
Fixed problems with node groups in Blender 4.0 beta caused by changes in the Blender API

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Node Preview v1.20 Released