Your calculated hash rate will always depend on the actual shares that you find. Your average calculated hash rate should be close to your reported hash rate after 24 hours.
I am personally used to mine on dwarfpool. Have tried ethermine and other pools, even if the stats are not always uptodate, servers work and this is one of the bestest pools to my opinion. Thats also why me and my team started our proxy service with dwarfpool first.
You will always have variations with your calc hashrate, if the calc hashrate is now 200, 1 hour later it could be 150 then 1h later 250. What is important is the long term average calc hashrate.
If on average you are within mining software shown hashrate +/- 5% it is good If you get higher, your mining software is a good one if you get lower, your mining software is scamming you
Comments
My stats for Dwarfpool Eth:
Sent hashrate: 25.21 (Mhs)
Calc hashrate: 33.96 (Mhs)
I'm only running some tests today with a single GPU but the above is after 6hrs of mining... I'm keen to understand why this is.
You will always have variations with your calc hashrate, if the calc hashrate is now 200, 1 hour later it could be 150 then 1h later 250.
What is important is the long term average calc hashrate.
If on average you are within mining software shown hashrate +/- 5% it is good
If you get higher, your mining software is a good one
if you get lower, your mining software is scamming you
https://forum.ethereum.org/discussion/5999/reported-hashrate-100-mh-s-effective-hashrate-is-about-70-mh-s/p1