Lumia 520 Slow down after Denim update

[Syed Abdul Mannan]

My Lumia 520 becomes very sluggish after the denim update.
Please suggest somthing.

 

[Harrie-S]

I would suggest a hard reset because if this started after the Denim OTA there was probably a glitch during the update.
I presume you already tried a soft reset and that you did not install an app which could case this or added for example Cortana as a tile to your start screen.

Good luck

 

[Syed Abdul Mannan]

I think the update was fine, however multitasking is very slow like for example switching between apps takes a lot of time.
I'm little conscious about my phone during the hard reset process.