It's on my priority list, but I don't have point to start. My suspicioun is on the PHP highlighter. I changed memory manager in current 5.0.4 build, I am trying to find memory leaks.
But if the problem occurs in page drawing + folowed actions like highlight all selections e.t.c. it's very hard to find it. -- <https://forum.pspad.com/read.php?4,73692,74120> PSPad freeware editor https://www.pspad.com