HTC ONE M8, internal storage 'other'... What is it?

[Unregistered]

Just bought a HTC One M8 and it works great... But when I go to storage, and more importantly internal storage... 8gb of my 16gb is already gone... 5gb is this is classed as 'other'... Does anyone know what this is? Also any hints or tips to stop my phone from slowing down and suffering from lag world be appreciated!

 

[belodion]

I believe that 'Other' refers to the Operating System...a fairly important part of the phone...

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