The speed of 2.4ghz would be sufficient as long as your are not too far away. The more prominent issue with 2.4ghz is interference and limited channels. Devices like cordless phones and microwaves cause interference, and the 3 non-overlapping channels that get congested quickly. That will have a much more impactful influence on performance in most cases. Have you used anything like Netspot or similar to see what the airspace looks like? If you can run that for a bit and post a screenshot I might be able to help a little with choosing wireless channels.
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