Well, have to admit to a moment of natural smile here, as though I’m sure persons have their reasons for using a NAS, it also sometimes seems like having an off-road SUV which only sees city streets 
In fact, though, I thought of it myself, for some idea of combining with a smaller laptop, but concerned among other things for the sorts of delays you see, in software other than Scrivener which would naturally show them.
Here are a couple of ideas, if they can possibly help:
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where do you have Scrivener installed? On the laptop would be correct (and likely). I’m just thinking about its need to reference spell dictionaries for example, which are in the install.
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the slows-after-pause that you see might hint another angle: Scrivener’s auto-backups.
Those should in all likelihood be stored on your laptop, both to avoid a pause while they write, and for diversity’s safety, also just plain assurance-of-write safety. You might check to be sure, in File | Options | Backup (icon on far right) .
This will be the place, unless you’ve made a special Project | Project Settings override.
And you could try om those settings just unchecking Automatic Backups for a moment, to see if your delay goes away with those off.
- third point of call would be your NAS itself. I would presume that would be always running, instantly available, but maybe it’s not – maybe it goes to sleep after a period of inactivity, then boots up the drives on request, as a battery setting on a laptop might.
You could look at this. And if it’s the problem, either set a longer keep-alive period if that’s possible, or ise the evident workaround, which would be to keep your Scrivener projects only on the laptop, and copy them (very thoughtuflly, only after fully closed…) to the NAS.
In fact, I’m not sure how you’re working on a project with and without the NAS at present…
Hope ideas here can help, and best with this…
Clive