I've searched a while but did not get very much information except the obvious ones - cache sizes.
Those would be the most useful ones. I think you have done most of what is needed, except to make the initial swap file size larger, to prevent thrashing. You have what used to be considered a "huge" hard disk (16 GB), use some of it for a big swap file (perhaps 200 meg would be a good starting point). Also, remember that you should measure the free real memory, after doing something that will force all the swapable parts to swap out, and stay there.
64 meg of memory was considered to be "huge" at one time, but programs were also written to handle low memory. Try to eliminate memory hogs, and use older programs, when they will do the job.
But eCenter still shows about >56MB used and 6MB swapper size after startup.
Hmmm. Have you considered NOT using eWorkPlace (XWorkPlace)? I think that uses a lot of memory. Any other add ons (DragText, nice, etc.) also use memory. Basically, if it wasn't part of Warp 3, don't use it.
A good chunk of OS/2 will swap out, and stay there until needed (usually error handlers), unless the initial swap size is too small, which will cause it to be swapped back in again. You still have lots of memory, but some of it will need to be swapped out, before it can be used, then, it will swap back in again, if the initial swap file size is too small. Of course a program like FireFox will eat up 64 meg of memory, just starting up.
Maybe I should deinstall Netbios as TCP/IP is probably enough for me. But does anyone know how much this will lower memory utilization?
I don't think it will be a lot. NETBIOS was designed to run in what we now call "low memory" situations, and I think a lot of it will swap out, and stay there, until needed. It is pretty easy to remove it, and put it back again, to see what happens.