Basically, no. @JMichaelTX gives a lot of good advice on possible ways to improve the performance, but no changes to Keyboard Maestro are likely to help you.
You need to figure out what is causing the performance issue, there are a bunch of plausible places to look:
- Keyboard Maestro has some overhead. Run a trivial script and you can see the base overhead.
- Compiling the script can be expensive - Keyboard Maestro will compile your script from text each time it is run unless you select a compiled script file.
- AppleScript is relatively slow
- AppleEvent interprocess communication is relatively slow
- The script itself could be using poor algorithms
- You could buy a faster Mac, or one with more memory, or a faster HD, depending on what the bottlenecks are.
There are many ways you might improve the performance of a macro that is executing an AppleScript, but there are no plans to make Keyboard Maestro magically run an AppleScript faster.