After many long years, the Memory64 proposal for WebAssembly has finally been released in both Firefox 134 and Chrome 133. In short, this proposal adds 64-bit pointers to WebAssembly.

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The Memory64 proposal for WebAssembly adds 64-bit pointers, now supported in Firefox 134 and Chrome 133. While 64-bit WebAssembly allows for addressing more memory, it tends to run slower than 32-bit due to necessary bounds checks and hardware constraints. This performance penalty can range from 10% to over 100%. Memory64 might be useful for applications needing more than 4GB of memory but comes at the cost of slower performance. Future optimizations and hardware improvements may reduce this penalty.

Is Memory64 actually worth using?

<p>The LLM-generated summary is more pessimistic than the article, which is cautiously optimistic for the future of Memory64.</p>
