Best ways to conduct Speed and Network Performance test from OpenWrt?

[lleachii]

Package to run speed test on router?

When my internet speeds suddenly become very slow, I often wonder if there's a problem on the WAN/ISP side or it's on the LAN (my equipment) side. If I could run a speed test on the router itself, that would isolate the WAN. Is there a package to do this, preferably from within LuCI?