Webserver serving very slowly when accessed via softAP but fine via normal route

[bucklevision]

So I've got a web server (using ESP8266WebServer.h), which is serving a couple of text pages to display variables, and allowing me to set the local network SSID/Pwd. The AP stays active after the local wifi connection is made.

If I connect through phone to the soft access point (172.x.x.x) I'm seeing 500 byte pages loading in maybe 10 seconds, sometimes crashing out, but if I access via the wifi connection to my local network (192.x.x.x) via the same phone I'm seeing them loading instantly. I'm guessing it's something in the AP config or DNS server (ESP8266mDNS.h) the AP uses. Does anyone have any pointers as to what I'm doing wrong?

[mcspr]

If you have some specific examples of 'crashing out', that would be a start. I assume you mean that your board is rebooting after an exception. See serial output, or capture it using crash callback. See issue template and our documentation related to exception handling and debugging reboot causes. Some example code also helps, platform version used, parameters used to build, build system, etc. Don't want to just guess :)