KWin has received an update to the 5.10.3 release. 5.10.3.1 contains a fix for https://bugs.kde.org/show_bug.cgi?id=381870 Freeze in KWin::checkGLError on startup which affects machines with an NVidia card.
The change is https://commits.kde.org/kwin/aefb5f4dd9d41aa7377d56ece203089c73aefe07 https://www.kde.org/info/plasma-5.10.3.php kwin-5.10.3.1 4.4MB 199e3a2593e9e66bbd6521ee8a25a012003d15f6b4bf2f102c70b798c9abd03a