docs/Optimization.md in flipper-0.11.0.beta3 vs docs/Optimization.md in flipper-0.11.0.beta4

@@ -46,13 +46,19 @@
 * **`:preload`** - An `Array` of feature names (`Symbol`) to preload for every request. Useful if you have features that are used on every endpoint. `preload` uses `Adapter#get_multi` to attempt to load the features in one network call instead of N+1 network calls.
     ```ruby
     config.middleware.use Flipper::Middleware::Memoizer,
       preload: [:stats, :search, :some_feature]
     ```
-* **`:preload_all`** - A Boolean value (default: false) of whether or not all features should be preloaded. Using this results in a `preload` call with the result of `Adapter#features`. Any subsequent feature checks will be memoized and perform no network calls. I wouldn't recommend using this unless you have few features (< 30?) and nearly all of them are used on every request.
+* **`:preload_all`** - A Boolean value (default: false) of whether or not all features should be preloaded. Using this results in a `preload_all` call with the result of `Adapter#get_all`. Any subsequent feature checks will be memoized and perform no network calls. I wouldn't recommend using this unless you have few features (< 100?) and nearly all of them are used on every request.
     ```ruby
     config.middleware.use Flipper::Middleware::Memoizer,
       preload_all: true
+    ```
+* **`:unless`** - A block that prevents preloading and memoization if it evaluates to true.
+    ```ruby
+    # skip preloading and memoizing if path starts with /assets
+    config.middleware.use Flipper::Middleware::Memoizer,
+      unless: ->(request) { request.path.start_with?("/assets") }
     ```
 
 ## Cache Adapters
 
 Cache adapters allow you to cache adapter calls for longer than a single request and should be used alongside the memoization middleware to add another caching layer.