Slow Luci GUI but not the router

I'm new to OpenWrt world and I just flashed my old Linksys WHW01 router with latest factory Openwrt. The internet is working with good speed but my Luci GUI is extremely slow. I know this is a GUI problem because my SSH connection is really fast as well. I did search the forum but I can't find any solution. Thank you for your help!

Too little information to actually help here...

Let's take a look at your config:

Please connect to your OpenWrt device using ssh and copy the output of the following commands and post it here using the "Preformatted text </> " button:
grafik
Remember to redact passwords, MAC addresses and any public IP addresses you may have:

ubus call system board
cat /etc/config/network
cat /etc/config/wireless
cat /etc/config/dhcp
cat /etc/config/firewall
cat /etc/config/uhttpd