ZS, Definietely worth a go, you can get installable version from SourceForge.
EDIT
I had a quick go and if you get this installed (I got version 4.4.1 from https://sourceforge.net/projects/sharpdevelop/), it will be great for you. It has a form designer and I easily created a window with a RTB in it - very similar to VS but my test project is running in 340 MB of memory. Also a version 5.1 from https://sharpdevelop.software.informer.c...ownloading.
Great Find
EDIT 2
I got the Auto Completion sample project to work in it so if you can get this sharpdevelop which is 32 bit going you will have something to work with.
EDIT
I had a quick go and if you get this installed (I got version 4.4.1 from https://sourceforge.net/projects/sharpdevelop/), it will be great for you. It has a form designer and I easily created a window with a RTB in it - very similar to VS but my test project is running in 340 MB of memory. Also a version 5.1 from https://sharpdevelop.software.informer.c...ownloading.
Great Find

EDIT 2
I got the Auto Completion sample project to work in it so if you can get this sharpdevelop which is 32 bit going you will have something to work with.