I can't do much about the amount of text I gotta read, I do have a line in my claude.md file to ask Claude to keep telling me about stuff that I missed or haven't responded to yet so I make sure I haven't missed any important stuff, and it's usually at the bottom of every response, Claude does talk a lot, (codex tends to be better at communicating) but what I found a bit helpful is the unslop skill by pstack, it can help your claude talk in a more read-friendly way. https://github.com/cursor/plugins/blob/main/pstack/skills/un...

when it comes to reading the diffs, I created my own app to review the diffs away from github, manage my PRs and do everything I could on github without relying on it's broken UI https://pyor.review

You could also just ask Claude to help you go through stuff bit by bit, you'll slowly build the skill and adapt to reading Claudish.