Of that data, a relatively small fraction changes periodically. Most of it is static. Generally, I only do remote DNS data retrieval periodically, not immediately preceding each and every HTTP request when accessing a www site.
Every user is different but by controlling what RFC 1035 calls the "Master File" of DNS data I can avoid remote DNS lookups altogether. This speeds up www use for me, greatly. YMMV.
The point that get missed in these discussions, IMHO, is that DNS is not just an issue of speed.^1 (And users can improve speed without help from third parties.) DNS is also an issue of control. Controlling DNS allows me as a user to disable the www's dark patterns where the user selects a domain name to access and the "browser" connects to various domain names to which the user had no intention of connecting.^2 I can easily thwart unecessary, unwanted phoning home, telemetry, tracking and online advertising because they all rely on using DNS that is, to some degree if not wholly, outside the user's control.
1. For example, Google can undoubtedly win the race for DNS speed however the www user will always lose the contest over _control_.
2. Originally this auto-fetching feature may not have been intended to support "dark patterns". However its usage today is a key element of those practices. There are companies today whose vision for the www is shaped by a need for programmitic advertising and the privacy invasion that this requires. They puch for standards and protocols optimised to support "complex" web pages comprised of many components, potentially controlled by various third parties, the most important of which are related to _advertising_. A www user might have a different vision. For example, I am able to use the www quite effectively for informtation retrieval (not commerce) without using auto-fetching.^3 I treat www pages as "simple" ones with only one significant component and none controlled by third parties. This allows me to consume larger quantities of information more rapidly, with less distraction. "Simple" www pages are more valuable to me than complex ones. Though they might be less valuable to "tech" companies seeking to sell advertising services.
3. Common Crawl, the source for much-hyped "AI" projects such as GPT-3, uses the www in a similar way. There are no components for "complex" websites such as Javascript files in the archives.