diff --git a/rust/Cargo.lock b/rust/Cargo.lock
--- a/rust/Cargo.lock
+++ b/rust/Cargo.lock
@@ -569,7 +569,10 @@ name = "rhg"
 version = "0.1.0"
 dependencies = [
  "clap 2.33.3 (registry+https://github.com/rust-lang/crates.io-index)",
+ "env_logger 0.7.1 (registry+https://github.com/rust-lang/crates.io-index)",
  "hg-core 0.1.0",
+ "log 0.4.11 (registry+https://github.com/rust-lang/crates.io-index)",
+ "micro-timer 0.3.1 (registry+https://github.com/rust-lang/crates.io-index)",
 ]
 
 [[package]]
diff --git a/rust/rhg/Cargo.toml b/rust/rhg/Cargo.toml
--- a/rust/rhg/Cargo.toml
+++ b/rust/rhg/Cargo.toml
@@ -7,4 +7,6 @@ edition = "2018"
 [dependencies]
 hg-core = { path = "../hg-core"}
 clap = "2.33.1"
-
+log = "0.4.11"
+micro-timer = "0.3.1"
+env_logger = "0.7.1"
diff --git a/rust/rhg/src/commands/debugdata.rs b/rust/rhg/src/commands/debugdata.rs
--- a/rust/rhg/src/commands/debugdata.rs
+++ b/rust/rhg/src/commands/debugdata.rs
@@ -5,6 +5,7 @@ use crate::ui::Ui;
 use hg::operations::{
     DebugData, DebugDataError, DebugDataErrorKind, DebugDataKind,
 };
+use micro_timer::timed;
 
 pub const HELP_TEXT: &str = "
 Dump the contents of a data file revision
@@ -22,6 +23,7 @@ impl<'a> DebugDataCommand<'a> {
 }
 
 impl<'a> Command for DebugDataCommand<'a> {
+    #[timed]
     fn run(&self, ui: &Ui) -> Result<(), CommandError> {
         let mut operation = DebugData::new(self.rev, self.kind);
         let data =
diff --git a/rust/rhg/src/main.rs b/rust/rhg/src/main.rs
--- a/rust/rhg/src/main.rs
+++ b/rust/rhg/src/main.rs
@@ -1,3 +1,4 @@
+extern crate log;
 use clap::App;
 use clap::AppSettings;
 use clap::Arg;
@@ -15,6 +16,7 @@ use commands::Command;
 use error::CommandError;
 
 fn main() {
+    env_logger::init();
     let app = App::new("rhg")
         .setting(AppSettings::AllowInvalidUtf8)
         .setting(AppSettings::SubcommandRequired)