For at least 99% of Alerts of Interest over the last 6 YEARS of using SQL Monitor, the lower pane's "Performance Data" is of nigh on zero use.

IF it might be of use, give us a "Load..." button next to that heading, and load it on demand.

When I'm ploughing through a hundred or so predominantly Blocking Process and Deadlock alerts, the most important information is in the Details and Processes tabs.

Page loading delays will decrease because you won't have to pull eye-candy charts that aren't read for the bulk of the time.

The "Delay..." option, for me, is something I'd use against each Alert Configuration at the All Servers level. Other folks may want to be a bit more granular, but at least "noise reduction" and "higher performance" could start at the Alert Config level, please...