Hi! I have a tabbed form with a datagridview on one tab. My code is a realtime system and runs fine until I load data into the datagridview. A particular loop of code, not at all related to the datagridview, runs at about 78mSec. After loading even 5 rows of data, I immediately see performance go to around 94 mSec. If I load a lot of data into the grid, like maybe 10000 rows of data, the performance can go to 200 to 220 mSec to perform the same loop. Again, this code is not even related to the datagridview. Any ideas as to why my execution time would be so severely impacted just by loading data into the datagridview on another tab? Thank you!