Why is 830 faster than 735

Mehh, they are both the same speed, maybe one has Lumia camera 5 and the other one doesn't but that's it. Benchmarks aren't the same as real life performance
 
I use a dab of toothpaste on a bit of kitchen towel to rub out small scratches from the face of my work watch. May work for a phone screen too (suggest try it on the bit of screen over the bottom buttons first).

I would not suggest it, the screen also has a coating and you will remove that also.
 

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