Restarting miner boost the speed

[RentGPU]

Is there a relation between restarting the miner and the hashrate , as i realized many times if i restarted my miner for any reason my hashrate increase at the begining of work it shows on the miner speed and also show a peak speed at the mining pool site .

[xhomerx10]

Is there a relation between restarting the miner and the hashrate , as i realized many times if i restarted my miner for any reason my hashrate increase at the begining of work it shows on the miner speed and also show a peak speed at the mining pool site .

 Hash rate is calculated based on the number of shares submitted in a given period of time; it is a simple calculation of shares/time.  I suggest you graph the results to see if there is any real correlation or you are selectively remembering the higher rates while ignoring lower rates.  Perhaps you are submitting shares from the memory of your device when you reconnect to the pool which would skew the average.

[frostedace]

Is there a relation between restarting the miner and the hashrate , as i realized many times if i restarted my miner for any reason my hashrate increase at the begining of work it shows on the miner speed and also show a peak speed at the mining pool site .

What are you mining? Some coins experience a reduction in hash if your monitor sleeps, not sure if that's related to your issue though.

[Za1n]

As the others have said, it is likely the result of the miner or pool estimating your shares at first. Once it runs awhile there is enough data to provide a more accurate average hash rate, which is normally a bit lower than the peak reading you may see when you first fire up your mining program. On the pool side it usually averages your results over a longer period of time, but again the day to day variance can be enough to make it seem like sometimes you are hashing at a higher rate than other times. In the long run though, everything evens out.

[taxmanmt5]

Is there a relation between restarting the miner and the hashrate , as i realized many times if i restarted my miner for any reason my hashrate increase at the begining of work it shows on the miner speed and also show a peak speed at the mining pool site .

You might be grabbing the last of the cached work from before the shutdown. Or even getting a false hashrate based on a stale share that is in your system from right before shut down.
I would not start and restart it over and over, that will just cause undue wear and possibly cause you missing submitting shares to a block in the process. The best and accurate hashrate is from the pool server, after shares have been submitted.