Whats going on with whatsapp?

WhatsApp is lagging so bad when i open it, sometimes i need to wait for 5 min or more till it catches up with the new messages, and i cant use it at all. I tried everything to fix it,(update, reinstall, delete backup, offload) It goes back to normal for few days then it starts lagging again. I found just few people on the internet that’s facing the same problem but no one knows how to fix it. Please i need someone to give me a way to fix it, the app is becoming unusable.