Why is my M8 HTC lagging?

[AC Question]

m8 htc is lagging

Since the March upgrade to 6.21.605.3 software my phone locks up for long periods of time and is lagging. It doesn't appear to be able to handle this software upgrade. Prior to the upgrade it worked fine.
How do I go back to my old operating system or get this phone to work properly. it is a year old and I am frustrated by its performance.

 

[belodion]

Re: m8 htc is lagging

Have you tried a Cache Partition wipe, and considered a Backup & Reset?

 

[romiust]

Re: m8 htc is lagging

Have you moved apps to sd card? This showed my phone

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