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I believe you have some antivirus or clean master app installed which causes this.
You could try to clear cache for xperia keyboard too. In fact,when I look at your other thread with chrome lag, I think you should either restart your device or go to settings-storage and clear cache.
I suggest you boot in safe mode:
/t5/FAQ/How-to-boot-your-phone-into-safe-mode/m-p/348008#U348008
Does the same lag occur?
Keeps on scanning the device, blocks some features etc. You can give it a try.