Good question. Bootstrap default package regardless of whether its installed by DW or you go to the Bootstrap website itself and link it to your website is well known for being bloated.
DW is not likely to help you anytime in the near future to reduce the bloat found in any framework dependecy css, js file, they've already been minimalised.
Bootstrap v5, which is not yet available in DW, does however attempt to lessen the overload as that no longer depends on the jquery library. The js dependency files are written in vanilla javascript which makes them less heavy and l believe the css file has been cleaned up a bit.
I believe you can go to the Bootstap website and customize, compile a version of the framework which only uses the component js, css that you use but as l never use any framework l dont have an knowledge of whats possible and whats not using this approach.
To build the best, most streamlined website there is no other option but to code it yourself. Any default framework, plugin is full of redundant code that your website most probably doesnt need so my advice would be to reduce your dependecy on such workflows unless you dont care about bloat, then youre free to use what approach you find necessary to get the job done, which largely depends on your skill level.
Ive been in web development for a long time and lve never seen the industry quite in the mess it is at the moment due to the introduction of too many frameworks, plugins, automated worflows which all produce less than acceptable coding but the majority turn a blind eye simply because many believe these workflows are necessary to compete financially. Well they may be right but there is no denying quality, professionalism and pride in what is being produced is the victim.
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