camera startup time regression

Status changed to 'Confirmed' because the bug affects multiple users.

Same here. Takes ages to open camera app. Nexus 4, OTA11

Multiple issues are at play:
1) the regression seemingly observed in http://reqorts.qa.ubuntu.com/reports/qa/performance/dashboard/index.html turned out to be only a temporary blip. Subsequent runs show that there was no recent change in camera app startup time (on krillin).

2) the startup time measurement done in http://reqorts.qa.ubuntu.com/ is tricked by the way the camera app does things: it starts as fast as possible but once started shows a black screen for several seconds. It turns out that from a user perspective the camera app does not take 2.5s to startup on krillin but closer to 4.5s. Stopwatch measurements are as follows:
- krillin (363): 4.5s
- arale (356): 5s
- turbo (110): 7s

3) on turbo and I suspect some other devices or some other circumstances, the camera app startup is exceedingly high (over 7s) which I believe explains the reports we are getting here. After studying it I could not yet pinpoint the exact cause for such a slowdown. However I noticed that launching the camera app from the SDK made it start considerably faster, in 3s instead of 7s. After digging I came up with a small script that reproduces that speedup: http://pastebin.ubuntu.com/17696727/
Finally, I realised that simply having a "tail -f /var/log/syslog" opened while starting the camera app was enough to do the trick.
I investigated the possibility of CPU cores not being online in normal camera app startup thus possibly slowing it down but manually turning them on did not improve situation.

Re 2): improvements specific to the camera app are landing soon. See https://code.launchpad.net/~phablet-team/camera-app/staging/+merge/298329

Could obtaining permissions to access the hardware slow down app startup time?

2) is fixed in the latest release

3) is left to fix

Hi, the camera start up time looks to be much improved (<4s) on my MX4 and BQ M10, thanks for your quick action.

Note, after trying it a number of time on both devices, I did see a strange thing with the BQ M10. On one of the starts it took about 14s seconds, not sure why. After trying again it was back to 4s again.

Regards

Dave H