Hi,

I found the delete or paste in vertical mode is very very slow in large file
even I click "accelerate by discarding undo information" !
(in Emeditor Pro 32bit 11.0.1)

How to reproduce the issue :
(1) new a text file, run menu\edit\advanced\numbering
(2) fill "first line" = 10000, "number of lines" = 80000
(3) goto first line (press ctrl+home), then run menu\sticky vertical mode
(4) select just one column in all lines (press shift+ctrl+end, then press shift+right)
(5) press delete ==> long time waiting !!

if I use regular replace "^." with "", it complete immediately !