It's no more news that Glo network is too poor in so many locations hence the slow speed of Internet browsing, downloading and streaming.
Anyway, some people are boosting the speed by just changing their current Glo APN to the ones below:
Change your Glo Apn to
web.gprs.mtnnigeria.net or gloflat.blackberry.net Although it might not yield same results for all but a good percentage of people has confirmed it working and faster than other glo APN.
It also works faster on The Glo 0.0 if you don't know the settings click here