@sebastian-galczynski Based on DNS lookups, it looks like they're using AWS, so data transfer from EC2 starts at something like $0.09/gb.
Assuming it takes about 26 mb of data per page refresh like you said and approx. 45s per page load, you should be costing them approx $0.10 every 30 minutes if you've set up your browser to auto-refresh every 45 seconds. In other words, you'd cost them about $2.40/day, or ~$72/month if you were to leave this running all the time. And if your coworkers do the same thing, that could quickly get very expensive for them. They should definitely look into this issue. They'd probably see a significant decrease in their cloud costs by making just a couple of little tweaks.
Keep in mind that if this were to be an N+1 query situation, there'd also be a much higher load on their servers.