If I have small amount of rows in grid like 4 or 5 as well as small amount of columns like 3 or 4 then the selection will be very fast. But if I have huge amount of rows like 40 or 50 and huge amount of columns like 13 or 15 then the selection will be pretty slow. Means if I select on row with multi select checkbox then it will take around .5 sec and if I select all the rows then it will take around 4 seconds.
So I think the amount of rows and columns could be the issue for this slow performance because wherever I have small amount of columns and rows , it's working fine .
Please find a solution for that.