How often? I set mine to discard after 60 minutes, except for slack, WhatsApp and a couple of others; cost is reload when I do venture into discarded tabs - e.g. I scan HN and Reddit headlines in the morning, open each interesting comments page in a tab; much later, when I have downtime, I visit them - but I used to reload to get the new comments. Now with ATD, they get reloaded automatically, so for that use it is even bette than the real thing.