FPC is a full Forth Development System with a built in editor, debugger and many other features making it an outstanding package. However, the vocabulary has grown to nearly 2500 functions - A real learning challenge. All of the source code is in text files. In fact, there are more source and help files in FPC than there are functions in fig-Forth. But the many features do not detract from speed for the experienced user.
All possible speed is milked out of the processor.
When added to the TCOM program small target compiled applications can be made. The program and files are large. One needs a couple of megabytes of disk space available. To do all that it does, the space is needed. For the professional programmer, FPC is an excellent model.