What to do when my Game Analysis takes too long?

Game Analysis runs Stockfish directly in your browser, on your own device — nothing is sent to a server for analysis. That is why the speed depends entirely on the machine you are sitting at. As a benchmark: on a MacBook Pro M4 (2024), a two-year-old laptop in daily use, a full review of one game takes about 2 seconds. On an iPhone 12, a four-year-old phone in daily use, the same review takes up to 10 seconds. If a review feels slow, try this: switch to an up-to-date browser (Safari, Google Chrome or Edge — they run WebAssembly far faster than older ones), close the heavy tabs competing for your CPU, and if you can, run the review on a stronger device such as a laptop or a desktop instead of a phone. For comparison: chess.com computes its game reviews in the cloud, on their own servers. That kind of compute is expensive, which is why it sits behind a paid membership. We give you Game Analysis completely free, and the trade-off is exactly this: the engine runs on your device, so an older phone simply needs a few more seconds. It is still the same Stockfish, and the same analysis — it just asks for a little patience. One last thing, in case it does not just feel slow but shows a red error or never starts: that almost always means the page is open inside another app's built-in browser — for example a link tapped inside Instagram, Facebook or TikTok. Those in-app browsers run a stripped-down engine that Game Analysis cannot use. Open chessrank.org in a real browser instead (Safari, Chrome or Edge) and it will run normally.