Serious performance regression iOS 4

Originator:mundue
Number:rdar://8134592 Date Originated:26-Jun-2010
Status:Open Resolved:
Product:iOS 4 Product Version:8A293
Classification:Regression Reproducible:Always
 
26-Jun-2010 01:30 PM Matt Martel:
Summary:

CGContextDrawImage is 10 to 20 times SLOWER on iOS 4.0 with older iPhone models.

Steps to Reproduce:

Run the iPhone apps, in the App Store:

reMovem v 1.5.1
http://itunes.apple.com/us/app/removem/id287976599?mt=8

reMovem free v 1.5.1
http://itunes.apple.com/us/app/removem-free/id286128390?mt=8

Expected Results:

Game play should be snappy; no screen delays expected.

Actual Results:

Screen drawing is so slow that the games an unusable on older devices.

Regression:

CGContextDrawImage is the culprit. It used to take 10 - 20 ms to render the whole screen. Now it takes over 500 ms.

Notes:

I am the developer of these two apps.

Game play seems acceptable on newer iPhone models.

Comments


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