Head first C # Chinese Version chapter 13th controls and graphics page590

 

Take a closer look at the performance issues

The pictures of the bees you downloaded are huge. This means that picturebox
It takes a lot of time to scale the image while displaying them. The reason why the program slows down when many bees fly in the beehive is that the pictures in the beehive are very

Huge
. When you set beecontrol
When the background is set to transparent, there are two things to do: first, we need to narrow down the image, and then we need to narrow down the background of the form, so that we can draw it to the transparent area behind the bee.

 

So what we need to do is first reduce the image before it is displayed.