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How a hobby project I built for myself hit 100K Active Users in one month, from 3/22 to 4/21.

Search Impact 30K. Actual search traffic is much higher but currently counted as referrer.

Traffic costs are a lot more expensive than most people think. Just shortening JSON key names cut our bandwidth by more than 20%.

A trailing / can make a URL look like a separate page to a search engine. Unified sitemap / canonical / hreflang / links across the site.

Multiplayer has to be built assuming network delay. Sharing a time reference and splicing remote events into your own timeline makes playing 'together' with someone dozens of ms in the past still feel natural.