# Edge-side includes

> The CDN caches the shared shell of a logged-in page and fills in the personal parts at the edge, so 20% more page views hit.

## Prerequisites

Research these first: [Content delivery](https://wiki.playquorum.dev/research/cdn.md).

## Engineering terms

- [Edge-side includes](https://wiki.playquorum.dev/glossary/edge-side-includes.md)
- [Cache hit rate](https://wiki.playquorum.dev/glossary/cache-hit-rate.md)

## Facts

Edge-side includes
- **Track:** Infrastructure
- **Era:** [Series A](https://wiki.playquorum.dev/eras/series-a.md)
- **Cost:** 2.25k 2.25k
- **Requires:** [Content delivery](https://wiki.playquorum.dev/research/cdn.md)

## See also

- [Research tree](https://wiki.playquorum.dev/research.md)

Source: https://wiki.playquorum.dev/research/esi