Thanks for the answer. So if i understand correctly, I should install everything onto the SSD drive except the B4A project folders.
Compiling a app with the IDE (i mean your project folders in specific) i would use the HDD.
When compiling a lot of files are regenerated/rewritten. You should use the HDD for this. Preferably a fast one.
If I'm compiling an app that uses a lot of libraries and resources, I assume it tries to read files from all over the place. For example, reading libraries from the B4A libraries folder, reading SDK information from the Android folder, and if you have Admob, it also tries to search from the Android folder. Plus any additional files or folders you specify in the Project Attributes.
And if I am also running Android virtual machines for debugging , then it would be running from the SSD, which is a lot of read/writes especially for a virtual machine.
But in my project folder, I think thats where most of the compilation takes place. Since that's where all my app's assets are located, the dex file for compiling, and where it saves the APK file. I guess Erel would know more about it, I'd be really interested to hear his response about this.