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-rw-r--r--book/src/SUMMARY.md1
-rw-r--r--book/src/performance.md16
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diff --git a/book/src/SUMMARY.md b/book/src/SUMMARY.md
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--- a/book/src/SUMMARY.md
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@@ -8,3 +8,4 @@
- [Template syntax](./template_syntax.md)
- [Filters](./filters.md)
- [Integrations](./integrations.md)
+- [Performance](./performance.md)
diff --git a/book/src/performance.md b/book/src/performance.md
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+# Performance
+
+## Slow Debug Recompilations
+
+If you experience slow compile times when iterating with lots of templates,
+you can compile Askama's derive macros with a higher optimization level.
+This can speed up recompilation times dramatically.
+
+Add the following to `Cargo.toml` or `.cargo/config.toml`:
+```rust
+[profile.dev.package.askama_derive]
+opt-level = 3
+```
+
+This may affect clean compile times in debug mode, but incremental compiles
+will be faster.