I am using Audacity 2.2.2 and Windows home 10 build 1803.
I use Audacity for podcasting.
I have a 53 minute audio file. Simply zooming out so it is like 2 minutes visible to four and so on takes a long time. I timed it at 12-14 seconds to do such a simple command.
Is this normal? I am very new to this.
I have the files in a shared google drive. I use google file stream to access them from my PC. I thought it was a copy of the file on my hard drive. But maybe it is slow because it is communicating through windows and google file stream up to the cloud?
I will copy the same file to my hard drive and see if I have the same problem.
Excited to find a community of users to learn from! 
It all depends on how slow or fast your PC is.
I regularly work on two hour projects - with my old laptop with its spinning meta hard disk Zoom to fit was similarly slow to your experience - but with my new hi-spec SSD laptop it is really qick to Zoom to fit a two hour (or even longer) project.
Audacity does not respond well over a network - much better to work with your project on your PC’s drive and the Export your final production to the networked Google drive.
WC
I think I figured it out. I was storing files in my Google Drive. I made a copy to put on my PC and the problem seems to have resolved.
You can put archive work up there, but not real time production.
Koz
with my new hi-spec SSD laptop it is really qick
If you need a serious speed boost, SSD is the way to go. One guy at work and I had very similar laptops except I had the SSD. I had to do a task on his machine and I thought it was broken. “No,” he said, “It always works like that.”
Koz
I wish this forum had a way to up vote or thumb’s up… thanks Koz…