Improve DEBUG build performance

[ThymoNL]

Right now a lot of information is logged and printed when running a debug build.
This results in a huge performance drop.

We should evaluate everything that's turned on in a debug build and determine if it's still useful to us. Some stuff can be taken out completely or have some additional conditions before it gets compiled in or executed.

For example we could turn debug logging on per subsystem instead of everything all at once.