make persistent caching not printing so much

turbopack/crates/turbo-tasks-backend/src/lmdb_backing_storage.rs

@@ -248,13 +248,6 @@ impl BackingStorage for LmdbBackingStorage {
         meta_updates: Vec<ChunkedVec<CachedDataUpdate>>,
         data_updates: Vec<ChunkedVec<CachedDataUpdate>>,
     ) -> Result<()> {
-        println!(
-            "Persisting {} operations, {} task cache updates, {} meta updates, {} data updates...",
-            operations.len(),
-            task_cache_updates.iter().map(|u| u.len()).sum::<usize>(),
-            meta_updates.iter().map(|u| u.len()).sum::<usize>(),
-            data_updates.iter().map(|u| u.len()).sum::<usize>()
-        );
         let start = Instant::now();
         let mut op_count = 0;
         let mut tx = self.env.begin_rw_txn()?;
@@ -417,10 +410,6 @@ impl BackingStorage for LmdbBackingStorage {
             tx.commit()
                 .with_context(|| anyhow!("Unable to commit operations"))?;
         }
-        println!(
-            "Persisted {op_count} db entries after {:?}",
-            start.elapsed()
-        );
         Ok(())
     }
 
@@ -626,6 +615,7 @@ fn serialize_task_data(
                         let mut serializer = symbol_map.serializer_for(&mut buf).unwrap();
                         if let Err(err) = serde_path_to_error::serialize(item, &mut serializer) {
                             if item.is_optional() {
+                                #[cfg(feature = "verify_serialization")]
                                 println!("Skipping non-serializable optional item: {item:?}");
                             } else {
                                 error = Err(err).context({