Where to see the power of calculation?
You can get it directly from your node, for example:
#!/bin/sh
./luck attach ~/.luck/luck.ipc --exec 'for(var i=0;i<fort.blockNumber;++i){console.log(fort.getBlock(i).totalDifficulty);}'
This command will print totalDifficulty for each block. You can save it to some text file and draw some chart using Excel or any other software.