The comment about the MME drivers in the preferences means that, if your HW supports WDM drivers, you should select them instead of the MME drivers. You’ll see them in the MIDI input/output if your HW supports them.
They are named:
“Example MIDI input A” This is the MME driver
“Example MIDI input A (WDM)”. This is the WDM driver
See this topic for more info about the WDM stuff.
Beside that, we really can not do much more for this on Windows, at least not without building our own dedicated HW (as Steinberg and Logic did in the past). Windows & timing simply sucks in general.
Some tips:
Keep your ASIO buffers as small as possible to get smaller MIDI timing errors
Try disabling one CPU for realtime Audio in Renoise. This will automatically prioritize MIDI.
Try if other ASIO drivers (ASIO4All) give you better results.
Try if optimizing the PC for background services helps (or if it makes it even worse).
If you have the choice between a Mac and Windows, choose a Mac (better said OSX). MIDI timing is always tighter on OSX because they designed their driver models to solve such kind of problems.