Deno boosts language server performance
Briefly

Deno Land developers have reworked many aspects of the Deno language server, commonly referred to as Deno LSP, which provides auto-completion in the editor and other capabilities. With Deno 1.43, auto-completion now takes less than one second in larger projects when it used to take six to eight seconds, enhancing the overall user experience significantly.
The improvements in Deno 1.43 focus on auto-completion performance and memory usage, addressing previous issues that hindered developers' productivity. Projects that previously caused out-of-memory errors in the LSP now operate without issue, showcasing a significant leap in efficiency.
Read at InfoWorld
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