Frontend & browser·Modules, bundling and the build
you generated the treemap and found one dependency taking up a third of the bundle.
Bundle analysis
Also calledbundle analyser, treemap report
Visualising what each module contributes to the output, usually as a treemap of the module graph. It is the only reliable way to answer 'why is this bundle 900 kilobytes', because the answer is nearly always one or two things and nearly never what you guessed. Read the compressed sizes rather than the raw ones, since those are what the user actually downloads.