Blitz is an easy to use, versatile BASIC compiler, designed to speed up the operation of all your BASIC programs. BLITZ! is fully compatible with the Commodore 64 computer, and has the following features:

• High speed P-Code.
• Small P-Code execution and runtime routines (6k Bytes).
• Extensions to standard Basic (such as VICTREE commands) are recognized automatically or can be forced.
• Program overlays are possible, and variables can be passed between chained programs.
• Compiled programs can be protected.

Here's a link to the manual.