I am having serious problems with my USB modem (it's a D-Link DWM-222) combined with my Raspberry Pi 4: I tried configuring it with wvdial, using a script called "sakis3g", I used the pppd deamon directly and I even tried with modem-manager and network-manager but I always obtain really low performances (something like 2.5 Mbit/s in download and 3 Mbit/s in upload) compared to the results I have using it with my desktop computer (I get at around 15 Mbit/s in download and 8 Mbit/s in upload). I guess the problem is with the Raspberry Pi but I really don't know what to do now, does anyone have any ideas?

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