Unfortunately, it is not updated in real-time as it is cached by cloudflare, so the data can be upto 30 minutes old. I am not sure what you mean by how often the miner adjusts. On the 17xxx ports (multicoin, same algo auto-switching ports), pool tends to mine until a block is found so you don't waste time and electricity by switching too early and missing the block. So it tries to recalculate and switch after finding a block.