The code provided is a YAML file and is already quite optimized. However, here are a few suggestions to make the code even more efficient:

1. Use the latest version of Docker Compose if possible to take advantage of the latest features and improvements.
2. Use the shorthand notation for port mapping to make the code more concise. For example, "5000:5000" can be written as "5000".
3. Avoid using unnecessary quotes around values unless they contain special characters. For example, "redis:alpine" can be written as redis:alpine.
4. Use caching when building containers to speed up the build process. This can be done by adding a cache_from parameter to the build section.
Here is an optimized version of the code with these suggestions applied:

```
version: '3.9'
services:
web:
build: .
ports:
- 5000
redis:
image: redis:alpine
cache_from:
- redis:alpine
```
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