to check the online status > Physical Connection, it will show the active connections and the packets in total & the time of the modem is up & running
At diagnostics has few tools to check such Diagnostics >> Syslog Explorer > web syslog may find some useful informations under the small window "syslog type"
At Diagnostics >> Traffic Graph, under the the black window will show how many traffic is been used
At Diagnostics >> Data Flow Monitor will show the current bandwidth is using each active connection of a user (if a user downloading heavy will show over 4000 -10000 kbps)
http://www.draytek.co.uk/archive/kb_vigor_dataflowmonitor.html
At Wireless LAN >> Access Point Discovery can check if other wifi networks are in the same channel
Also sometimes slow connection it can be issue with the DNS servers, if you have change them at the 2920 try an other one such google or opendns just for testing, LAN >> General Setup
You will need to log to the modem and see how good the adls/vdsl connection is or have disconnections or errors (low snr magrin value), it may be the modem it self if both wifi & wired is slow ... if the line has problem then the 2920 will not show it because is not responsible for line issues, can contact the isp to check the line quality as well
Also if you are keep updating the firmwares of the 2920 with out a clean installation (use of the *RST* file) can cause the 2920 not function correct due to conflicts with previous firmware bugs/issues
