Is it normal that the speed jumps up and down?

Yes, this is normal and expected. Speed statistics on NiceHash depend on your submitted shares. The software will usually show more constant values and the web statistics will show more dynamic values. You must compare the average speed on web statistics to the speed, shown in the software. If they are similar, everything is good, but if they are drastically different, you should inspect your connection, check if you have chosen the optimal stratum server, and if the mining software is stable.

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