Hi, I have:
root@canne:~# dpkg -l | fgrep kwin
ii kde-window-manager 4:5.8.0-1 all transitional package for kwin-x11
ii kwin-common 4:5.8.0-1 amd64 KDE window manager, common files
ii kwin-data 4:5.8.0-1 all KDE window manager data files
ii kwin-style-breeze 4:5.8.0-1 amd64 KWin Breeze Style
ii kwin-style-qtcurve 1.8.14-3+b2 amd64 QtCurve window decoration for KWin
ii kwin-x11 4:5.8.0-1 amd64 KDE window manager, X11 version
ii libkwin4-effect-builtins1 4:5.8.0-1 amd64 KDE window manager effect builtins library
ii libkwineffects9 4:5.8.0-1 amd64 KDE window manager effects library
ii libkwinglutils9 4:5.8.0-1 amd64 KDE window manager gl utils library
ii libkwinxrenderutils9 4:5.8.0-1 amd64 KDE window manager render utils library
ii qml-module-org-kde-kwindowsystem:amd64 5.26.0-1 amd64 provides integration of QML and KDE frameworks - kwindowsystem
root@canne:~#
Don't think missing kwin is the problem. I notice an awfull lot, 1048 kworker processes running.