[1.Description]: [Flame v2.5][Music NGA]When launch Music NGA app, pan up and down the page and tap a song to play ,the device gets stuck. Occur Time: 9:26 Attachment: logcat926.txt & Flame v2.5.3gp [2.Testing Steps]: Prerequisites: Have a few music files on the device . 1.Launch Music NGA. 2.At the Music page ,pan up and down the page with your finger. 3.Tap bottom icon of the page. (such as Playlist , Albums) 4.At the page in step 3 ,pan up and down the page with your finger and tap a song to play. [3.Expected Result]: 1&2&3&4.The device should be fluent. [4.Actual Result]: 1&2&3&4.The device gets stuck. [5.Reproduction build]: Device: Flame KK 2.5 (Affected) Build ID 20150917150223 Gaia Revision aede8622d780ec71f766a3ecccbff74c04aaba4e Gaia Date 2015-09-17 03:40:46 Gecko Revision https://hg.mozilla.org/mozilla-central/rev/3929b8fc6c33bf9cc80299743063f0981f545452 Gecko Version 43.0a1 Device Name flame Firmware(Release) 4.4.2 Firmware(Incremental) eng.cltbld.20150917.183330 Firmware Date Thu Sep 17 18:33:40 EDT 2015 Firmware Version v18D v4 Bootloader L1TC000118D0 [6.Reproduction Frequency]: Always Recurrence,5/5 [7.TCID]: Free Test

Once all the features lands for NGA, our focus will be on stabilization and performance.

This problem can't be reproduced on old Music app. It is NGA Music only. Device information: Flame KK v2.5 Build ID: 20150921073455

We will be working on performance and optimization in the next two sprints. We have a few functional bugs that need to be fixed. Thanks Hema

Performance optimization works are being addressed here: 1210440. We have several bugs on the same issues -- merging them