Add flamegraph of a Tx

README.md

@@ -92,3 +92,15 @@ As an example, to show only error messages from the replay crate, run:
 ```bash
 RUST_LOG=replay=error cargo run block mainnet 648461
 ```
+
+### Flamegraph
+
+In order to create a flamegraph you first need to install [cargo-flamegraph](https://github.com/killercup/cargo-flamegraph):
+```bash
+cargo install flamegraph
+```
+
+To produce a flamegraph of a transaction execution run:
+```bash
+cargo flamegraph --root --dev -- tx 0x1b84bb4760a05c88ceab90a4fb9f37e2f518c822a655abe46361a61a88200fa mainnet 656535
+```