A10 checks 4 simple things in external traffic:
Do they buy? (8%+ conversion rate needed)
Do they add to cart? (12%+ even if no purchase)
Do they stay long? (25+ seconds on page)
Do they bounce fast? (<40% leave immediately)
Good traffic = High buying + long stays = better rankings
Bad traffic = Lots of clicks but no buys + quick leaves = worse rankings
Rule: Only send "warm" people who already want your product. Bots or random clicks hurt you.
Test small first: $20 traffic → check numbers Day 3 → scale only winners.