I am using Macbook Pro 2014. 2.6Ghz i5 processor, 8GM 1600Mhz memory. I installed two versions of matlab, 2015a and 2018b. When I edited my codes in 2015a, everything is fine. However, running 2018b on the same machine, the code editor is very laggy. By "laggy", I mean when I simply tried to move the cursor or type some texts, it may respond after 1-2 seconds. Sometimes, the left bottom corner popped out info "processing...". I didn't see this info in the previous matlab version. Is the new version running something new in the back to cause this laggy issue? Am I the only one having this problem?