[gooosle]

They mention later in the article that the 500ms is p75.

Realistically 50ms p75 should be achievable for the level of complexity in the shopify app.

[bushbaba]

P75. I can only image the p90 and p99 are upwards of 1 second.

[akie]

Agreed. The P95 and P99 in particular are likely to be over 1 second, possibly over 2. They chose P75 to be able to post a seemingly impressive number.

I personally wouldn't be very happy with a P75 of 500 ms. It's slow.