Gotcha, your issue is most likely wifi speeds, even with them physically close, the AAPs throughput is going to be a small fraction of ethernet or high-speed wifi, it's wifi capabilities are just limited.
The way I understand it works - This is just slowness in presentation between the AAP (after a picture) and your iPad displaying it for you, it has little to do with image capture between camera & AAP or how fast the AAP is running internally. Once you initiate say an autorun of 20 exposures for 5 min each - right after you click start, it's entirely running between the physical hardware (AAP, cables, cameras) and it's being run by the on-ASIair software installed on the microSD card... You can technically close the ASIAir app and never open it again and everything will complete perfectly, even a shutdown and the next day all your pics are there.
What you are likely experiencing is the lag of transferring your most recent photo between the AAP after it saved it to the USB stick to your ipad via wifi - that can take a few seconds, and due to the wifi weak strength I've even seen it have blips and fail to load, or hang for 10 seconds while it re-establishes connection... good news is your stuff is totally safe on hardware since the iPad is only a viewer, it doesn't actually do anything or store anything there.
So first step, try an ethernet, even indoors with the AAP connected to your router and take a pic with lenscap on just to see how much faster it will be. the quicker USB sticks, MicroSD cards will boost the AAP's internal processing substantially so that too will increase overall speed which could shave another second or two off every capture, it also makes the app feel snappier.
the last troublshooting item is to switch USB cables... I personally have found that basic/cheap cables are abundant and they are usually the cause of issues. Last week I was having mount issues with my AAP & CGX. I had tried 5 USB cables and 4 out of 5 were bad. all basic non-branded cables - but they are bad more often than not. and some USB cables out there are charging cables not data cables so they are even missing internal wiring to support communication. but the fact you tested that cable on a PC tells me that's likely not the case... this is just one more thought.