I definitely noticed myself moving my lips as I read during the JLPT. In a sense it probably slows me down, but it also helps reinforce how the reading should sound … which is all to say that I should be reading a lot more so that I can get past that stage.
@Shiawase For jlpt-specific resources, I’d recommend japanesetest4you.com, which is full of free study materials including sample readings with questions to get you used to the format. Here’s an example:
I don’t know what level you took, but you can look on the right side of that page and find the appropriate level. Also, I’m lucky enough to live in a city with a branch of the Japan Foundation, which has a terrific lending library including all the JLPT study materials you could want. Don’t know where you live, but they’re a great resource if you’re near one.
Since you mentioned Satori Reader, I subscribed for a year when it was a new service, but I found it too much beyond my level at that point, so the readings were slow-going and ultimately not that enjoyable. Since I’ve learned so much more vocabulary in the last year thanks to WaniKani, I decided to give it a try since they had a special recently with 3 months at half price each or something. I’m re-reading things I’d previously struggled with and finding them much easier. I kind of don’t think I’ll keep subscribing after the three months, but for now, it’s a reasonably low-stress way to read more-or-less interesting material. It’s probably most useful around N3 level after which it will probably seem mostly too easy.
Anyway, as others have said, I think the more you read, the faster you’ll be able to read with understanding. By the way, I was in the same boat as you, not being able to finish the reading portion of the JLPT, so let’s improve together for next time.