Since v9.300 there is a new, undocumented feature which should have been there since the beginning of Wi-Fi at UTM: 40Mhz channel width to actually allow the claimed max. 300MBit/s.
It's not possible to change via WebAdmin, you have to do it via shell, for each AP:
$ cc ⏎
OBJS ⏎
awe ⏎
device ⏎
REF_Ap*** ⏎ (press TAB twice to list possible AP REFs)
channel_width=HT40 ⏎
channel_width11a=HT40 ⏎
w ⏎
exit ⏎
Please keep in mind that the AP will fallback to 20Mhz if required by the environment. Clients can force APs to not utilize 40Mhz, for example.
Anyone not satisfied with current throughput should try this, though. [:D]
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