add docs for builtin default cu change (#278)

content/docs/references/feature-gates/c9oahlxdbm3sswtjx1ybgzpy55r2rarhmn1pbqn6hogh.mdx

@@ -0,0 +1,40 @@
+---
+title: Reserve Minimal CUs for Builtins
+seoTitle:
+  "Reserve Minimal CUs for Builtins:
+  C9oAhLxDBm3ssWtJx1yBGzPY55r2rArHmN1pbQn6HogH"
+---
+
+**Feature Key**:
+[`C9oAhLxDBm3ssWtJx1yBGzPY55r2rArHmN1pbQn6HogH`](https://explorer.solana.com/address/C9oAhLxDBm3ssWtJx1yBGzPY55r2rArHmN1pbQn6HogH)
+
+This feature gate reduces default CU allocation for builtin program instructions
+down from 200,000 to 3,000 CUs to improve validator performance.
+
+## Impact
+
+Less than 0.00001% of transactions will be affected by this change.
+
+**Developers** should always use compute budget limits to explicitly allocate
+CUs for their transactions. This change will not affect transactions that
+explicitly allocate CUs.
+
+The following builtin programs will have their default CU allocation reduced to
+3,000 CUs by this change:
+
+- Stake11111111111111111111111111111111111111
+- Config1111111111111111111111111111111111111
+- Vote111111111111111111111111111111111111111
+- 11111111111111111111111111111111
+- ComputeBudget111111111111111111111111111111
+- AddressLookupTab1e1111111111111111111111111
+- BPFLoaderUpgradeab1e11111111111111111111111
+- BPFLoader1111111111111111111111111111111111
+- BPFLoader2111111111111111111111111111111111
+- LoaderV411111111111111111111111111111111111
+- KeccakSecp256k11111111111111111111111111111
+- Ed25519SigVerify111111111111111111111111111
+
+## Activation
+
+This feature is not yet activated on mainnet.

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