No, not writing it, I mean fetching it. So if you type e.g. System.out.println and hit the keycombo the documentation shows up, IntelilJ can also do this for custom functions (mostly use this feature in PHPStorm though, so not sure if IntelliJ does it, but same suite of products).
And in terms of race, I mean that you get a lot of small issues to fix with a small time frame, usually it's a race to finish the issue. If it's something larger, logic puzzle, then yes, it's not a race.
No, by speed I mean in terms of things that oft repeated you can use built-in IDE tools, e.g. if you need getters and setters for something, convert it from a chain of if/else to a switch (haven't had that in quite a while myself though), constructor build, not the actual UX. I don't experience slow-downs in IntelliJ/Netbeans/GoLand/VS Code since I installed an SSD with 16GB of RAM, but my projects are probably a lot smaller than yours. That's why the indexing pause/disabling suggestion for you.