Some background to the question:
A few weeks ago I set up a media server on my Pi 2 using minidlna, it was connected to my home network and could stream 720p 60fps video very well. I did, however, want to make it portable, so I bought a Pi 3 B+, and I set minidlna up as before, and also installed hostapd and dnsmasq in order to use it as wireless access point. I followed this tutorial for that: https://www.raspberrypi.org/documentation/configuration/wireless/access-point.md
However, after completing that tutorial and connecting to the wireless access point using my phone, the server was acting a lot slower than it was before on the weaker Pi 2. There was a 2 to 3 second lag between opening a folder and the items in the folder loading, and then video wasn't streaming as well with a bigger pause before it started playing.
My actual question: Why is this, is it down to hostapd using system resources? I considered this but surely the significantly more powerful 3 B+ wouldn't run slower even with hostapd installed, so what is causing the server to run slower?