High Cpu usage rate when drawing a great number of lines in IE7

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When I used flot to draw line in my site, I found when I draw a great number of 
lines at one time in IE7, it would lead to a high CPU usage rate and last for a 
long time.

For example, I have 20 lines and each line has 40 points, when flot starts to 
draw, the CPU usage rate for IE7 is up to 30%, and after nearly 20 seconds, the 
lines show up.

During this time, my computer seems dead.

Original issue reported on code.google.com by peiz...@gmail.com on 19 Aug 2010 at 8:11

Attachments:

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[GoogleCodeExporter]

The VML support used in IE is indeed much slower than the canvas support in the 
other browsers. However, I have successfully plotted much more than 1000 of 
points in 1-2 seconds on IE6 so it's a bit odd.

You can try turning off points and only draw the lines, this I think will be 
much faster as it won't have to draw all the small circles and fill them. You 
can also try disabling the shadows.

Otherwise, there's recently been introduced a Flash emulator for the canvas tag 
(I think it's called Flashcanvas). You could try that and see if it's faster 
for you.

I'm going to close the bug as I can't really do much about the problem.

Original comment by olau%iol...@gtempaccount.com on 13 Dec 2010 at 5:49

• Changed state: WontFix

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Original comment by dnsch...@gmail.com on 4 Jun 2012 at 2:41