Hint or shuffle
Both tools are honest: neither loses the game or counts as cheating.
The hint
A hint points at one pair you can take and puts ten seconds on the clock. Reach for it when a pair should be there but your eyes have stopped seeing the board.
The shuffle
Shuffling costs no time. The remaining tiles are dealt again, and that new spread can be finished too. It is the right move when hardly any pairs are open.
Which comes first
Start with the hint: it trains your eye. If the board is still empty afterwards, shuffle. Either way the time goes into the records kept in your browser.