diff --git a/.github/workflows/ci.yaml b/.github/workflows/ci.yaml
index 94b4e29..aa01570 100644
--- a/.github/workflows/ci.yaml
+++ b/.github/workflows/ci.yaml
@@ -1,11 +1,6 @@
 name: Tests
 on: [push, pull_request]
 
-env:
-  CARGO_REGISTRIES_CRATES_IO_PROTOCOL: sparse # Should improve the speed of the build and the cache size.
-  ZSTD_CLEVEL: 10 # We want some tradeoff between speed and size.
-  ZSTD_NBTHREADS: 2 # We only got 2 cores.
-
 jobs:
 
   check:
@@ -192,8 +187,6 @@ jobs:
           args: --features=no-asm --release -p karlsen-miner
 
       - name: Run cargo test release no parking_lot
-        env:
-          RUST_BACKTRACE: 1
         uses: actions-rs/cargo@v1
         with:
           command: test
diff --git a/src/watch.rs b/src/watch.rs
index c8908fd..9754c97 100644
--- a/src/watch.rs
+++ b/src/watch.rs
@@ -445,13 +445,11 @@ mod tests {
                 let barrier_clone = Arc::clone(&barrier);
                 let handle1 = thread::spawn(move || {
                     barrier_clone.wait();
-                    thread::sleep(std::time::Duration::from_millis(1)); // Added sleep
                     assert_eq!(tx.wait_for_change(), Err(ChannelClosed(())));
                 });
                 let barrier_clone = Arc::clone(&barrier);
                 let handle2 = thread::spawn(move || {
                     barrier_clone.wait();
-                    thread::sleep(std::time::Duration::from_millis(1)); // Added sleep
                     drop(rx);
                 });
                 barrier.wait();