Slow Giff Gaff Mobile Interent

Is anyone using mobile internet from the Giff Gaff network? Recently the home broadband stop work so I decided to buy internet bundle. And the Giff Gaff have very cheap bundles. I bought 25 GB for 12 pounds and it’s for month. Before occasionally I used mobile internet from EE network. When start use mobile Internet from Giff Gaff which is on O2 network I realised that is quite slow comparing to EE. I live in Peterborough and my smartphone on Giff Gaff network use only HSPA, HSPA+. Can’t check 5G cause my smartphone got just 4G network. On the other hand on EE network I always catch 4G. When I check service status I always see the same

Sometimes I have to double click the site to load cause it says that site couldn’t be loaded. Also google captcha often can’t establish connection. And I can just dream about streaming cause network is too slow for that. Therefore I don’t recomend you guys to use mobile interent from GiffGaff. What is your experience with Internet from this network???