Add query preprocessing skip guide

Author: DmitryTsepelev

README.md

@@ -86,6 +86,8 @@ Since our queries are slim now, we can switch back to HTTP GET, you can find a [
 
 [persisted-queries-link](https://www.apollographql.com/docs/react/api/link/persisted-queries/) uses _SHA256_ for building hashes by default. Check out this [guide](docs/hash.md) if you want to override this behavior.
 
+It is possible to skip some parts of the query lifecycle for cases when query is persisted—read more [here](docs/skip_query_preprocessing).
+
 An experimental tracing feature can be enabled by setting `tracing: true` when configuring the plugin. Read more about this feature in the [Tracing guide](docs/tracing.md).
 
 > 📖 Read more about the gem internals: [Persisted queries in GraphQL:

docs/skip_query_preprocessing.md

@@ -0,0 +1,17 @@
+# Skipping some preprocessing steps
+
+It does not make much sense to revalidate persisted query—we did it earlier, so it can be disabled in the `#execute` call:
+
+```ruby
+GraphqlSchema.execute(
+  params[:query],
+  variables: ensure_hash(params[:variables]),
+  context: {
+    extensions: ensure_hash(params[:extensions])
+  },
+  operation_name: params[:operationName],
+  validate: params[:query].present?
+)
+```
+
+Moreover, some analyzers can be disabled as well: in order to do that just pass the same check `params[:query].present?` to the context and then add early exit to your analyzers based on this flag.