How to fix that annoying SwiftKey lag on Galaxy S6 and Note 4 (root req'd)
That delay is due to forceclosing and redraw of the stock keyboard that for some reason is connected to Samsung's much maligned SPCM service that also has been blamed for the overly aggressive RAM management on its recent Android phones.
In any case, you can get rid of the delay in the SwiftKey keyboard draw on your Samsung Galaxy S6 (also shown working on the Note 4, and perhaps others with the latest update). Here's what you need to do:
1. On your rooted Galaxy S6 or another Samsung gear with this problem after the latest Android update version, go to the Play Store, and install a build.prop file editor, like Build Prop Tweaker, or whatever else tickles your fancy (ES File Explorer would do, too);
2. Open your build.prop file, and replace the line:
sys.config.spcm_enable=true
with
sys.config.spcm_enable=false
3. The SPCM servce culprit should be disabled now, and your keyboard lag should be cured, along with other nasty RAM management surprises the latest Samsung TouchWiz edition.
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