I think your issue on the time is taking the manga to cover the Hero Hunter’s Arc is misplaced. Also, OPM is a satire, not a parody, and it’s always been filled with run of the mill shonen style fights, the difference is in the way Saitama resolutes the important ones, but that’s another issue. If you read the webcomic, then surely you have realized that everything was just an expansion in scale. In the 18 Years Of 24 Jack Bauer Kiefer Sutherland Thank You For The Memories Shirt , you can only feel the scale of power and you can buy that this group of like 20 monsters can destroy the world only after the Dragon Level monsters start to defeat the Heroes, making it so much impactful when Garou comes in as a monster and flattens Golden Sperm in seconds.
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In the manga, since the Monster Association is bigger (which makes more sense) you get to see more Heroes, more Class A and B civilians which works wonders for the 18 Years Of 24 Jack Bauer Kiefer Sutherland Thank You For The Memories Shirt Heroes conflict, and get more in-depth in every Class S. It explains why Metal Bat and Metal Knight didn’t participate in the raid and expands a lot on Garou, making his strength increase more natural.
The manga is moving at a crawl pacing? No, is the release of chapters what’s slow. If you read the 18 Years Of 24 Jack Bauer Kiefer Sutherland Thank You For The Memories Shirt from King meeting Saitama, now that it has reached the invasion of the Monster Association base, and continue the web-comic from Zombieman vs Homeless Emperor, it flows without an issue and plants more seeds for what’s to come, example of this would be when reaching Flashy Flash vs Speedo’ Sound Sonic.