But the number one cost to load a page is JS. JS payloads are the main cause of slowness based on time spent, and a majority of the JS people ship is dead code (global average is about 50%). So yes, JS is related to the main problem.
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Are any frameworks maintaining their own bundlers?!?!?!
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Every framework did, some frameworks still do a lot of "bundling" before handing off to a standard tool.
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Yup Ember and Angular have probably the most custom build/bundling Code. But preact and Vue also have FW maintained loaders (used in 1st party CLIs) and more to improve FW bundling/tree shaking. Still not perfect but improving.
End of conversation
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