Keep in mind that a RAW is about 50MB and the JPG-L is around 15MB so downloading files will be slow over Wi-Fi. 5G Wi-Fi gives you more speed but shorter distances. I'll use a USB-C to USB-A cable and connect to my PC to download files and that's still not the fastest when you're downloading hundreds of images. If you pull the cards out and use an adapter, it is a little faster, at least with my setup.
There is a price to pay for resolution and disk space consumption. I store my images on a Network Attached Storage (NAS) with RAID 1 to ensure safety and that slows the process down another notch even when you have a gigabit network.
As a suggestion: If you haven't done it, check to be sure you are using the best channel for your Wi-Fi connections. Often Wi-Fi routers will use the same channel which means that your neighbors are on on the same channel with you, causing interference and slowdown. There are free Android phone apps which allow you to measure the signal strength and channel usage to help determine if you need to move to a better channel. Google for help and there are tons of articles.
Now that I have my R5, I've found that it is far faster than my R at downloading images. A typical raw image takes about 1-2 seconds as opposed to 30 seconds with my R.
I download them to my PC via FTP as soon as they are captured so When in range, they are there before I get back to my PC. When I'm out of range of the radio, they start downloading about a minute after I get into range. Obviously, its not practical to use for hundreds of images, but for 20 or 30, it works great. I even tried downloading 80 mb dual pixel raw images, that took more like 3-5 seconds each.
I have several 5GHZ access points all with the same login. My phone switches automatically as I move around, I don't see that happening with the camera.
I have no neighbors within almost 1/2 mile, and I use the strongest channel. The closest AP to my PC is about 8-10 ft I get a extremely strong signal.
I could not manage to get the camera to FTP to my NAS but images are copied to it from my PC and backed up to another NAS nightly. They are also backed up with a snapshot which is duplicated on the 2nd NAS as well.
I'm just using a SD card in my R5 right now. I'll get a CF Express card in a week or so, I expect to see sales for Prime Day.