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Why is LiChess so fast?

They're actually using MySQL, afaik. It's a decent database, and open source.
I have been learning SQL in database. Not that it is my intention but I figured since I will be likely managing a team of people using SQL I needed to know at least the basics myself.
Lichess is fast because thibault is a really great & efficient software designer & programmer !!! We are lucky to get this awesome chess site !! Thank you Thibault for your hard work & your passion on lichess !!
Other chess site have heavy programation that make them slower to respond.... Lichess is the best :-)
The first site to solve the lag calculation problem should get a nobel prize.
- I hate it when the opponent gets 0,5 seconds added on his every move. I sit and wait and have to make premoves, but he still gets additional time.
- I hate it when i loose time, even when i make premove.

Somehow this seems impossible to solve for the techguys.
Good architecture, good technology choices. Thibault is a top 1% developer, easily.
By far the greatest source of lag is geographical lag. I live in the United States so an average ping time for me is 400ms. Chess.com, however, is a USA server (I think). As a result, if you're visiting chess.com from Europe, the geographical lag will also be high.

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