Merge pull request #219 from markus-gsf-seidl/feature/server-side-ren…

…dering

Use server-side rendering for high-traffic pages

docs/catalog/web/use-server-side-rendering.md

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+---
+version: 1.0
+submitted_by: markus-ntt-seidl
+published_date: TBD
+category: web
+description: 
+tags: 
+ - web
+---
+
+# Use server-side rendering for high-traffic pages
+
+## Description
+
+Modern web applications feature a lot of interface elements that are stored in templates on the server. This template is downloaded with the application code and then rendered with, optionally, requested data from the server.
+This can dramatically increase the SCI in different scenarios: When the client device doesn't have access to green energy, when the page usage is short (for example: accidental clicks, pages with short dwell time like landing pages) or if a lot of server-round-trips are needed to gather data.
+
+
+## Solution
+
+Consider using server-side rendering as a method to reduce energy consumption on client side. Frameworks like Angular or React already provide solutions on how to implement this efficiently.
+Server side rendering can improve side loading times (including rendering time on slower hardware), reduce network requirements (less round trips needed), can utilize caching (pre-rendered pages can be stored on the client device).
+
+## SCI Impact
+
+`SCI = (E * I) + M per R`  
+[Software Carbon Intensity Spec](https://grnsft.org/sci)
+
+Server side rendering affects the SCI in the following aspects:
+
+- `E`: Pre-rendering once can dramatically reduce energy consumption; pre-rendering on every request can reduce energy consumption if the server is more energy efficient and has access to green energy
+
+## Assumptions
+
+- Assumes that the used frontend technology allows for pre-rendered content
+- Assumes that the web page is visited in high volume to affect the overall SCI impact
+
+## Considerations
+
+- Consider using a caching mechanism to store rendered pages, if they change frequently but still are met with a high load. This can significantly reduce the server load by serving pre-rendered content for frequent requests.
+- Consider the other patterns in the web category
+
+## References
+
+- [Azure Well-Architected Framework Sustainability Pillar](https://learn.microsoft.com/en-us/azure/architecture/framework/sustainability/sustainability-application-design)