Issues with Livecode 10.14.2 on Mojave?

[David Bovill]

I've been having issue with my LiveCode installation for a few weeks
now.... basically the script editor slows down to a crawl, and barely
accepts mouse clicks. I also got  warning dialogue pop-up from Apple about
Livecode not being compatible with Mojave and future version....

Anyone else having issues? Know issue? I'm dealing with arrays that are a
bit larger than I usually process - but only 10MB of json. Trying to track
this one down - any advice appreciated!