Improve Grid View display performance in iPhone

Question

I have a grid view, and I want to draw rectangles inside each cell of this grid view,

The rectangles here represent an event or reminder, so when I get the reminders and events from native calendar, I filter them to get the events for each day separately so I can draw them in appropriate cell in grid view, but this approach has bad performance.

So how can I draw these events in grid view with excellent performance? How can I avoid the delay generated by filtering events for each day of month?

Answer 1

Use NSOperationQueue to do a background process