diff --git a/milli/src/update/new/extract/faceted/extract_facets.rs b/milli/src/update/new/extract/faceted/extract_facets.rs
index e6c3b02e6..8ca9a8b20 100644
--- a/milli/src/update/new/extract/faceted/extract_facets.rs
+++ b/milli/src/update/new/extract/faceted/extract_facets.rs
@@ -211,7 +211,7 @@ impl DocidsExtractor for FacetedDocidsExtractor {
         let attributes_to_extract = Self::attributes_to_extract(&rtxn, index)?;
         let attributes_to_extract: Vec<_> =
             attributes_to_extract.iter().map(|s| s.as_ref()).collect();
-        let thread_local = ThreadLocal::new();
+        let thread_local = ThreadLocal::with_capacity(rayon::current_num_threads());
 
         {
             let span =
diff --git a/milli/src/update/new/extract/searchable/extract_word_docids.rs b/milli/src/update/new/extract/searchable/extract_word_docids.rs
index 6da793276..dde969614 100644
--- a/milli/src/update/new/extract/searchable/extract_word_docids.rs
+++ b/milli/src/update/new/extract/searchable/extract_word_docids.rs
@@ -342,7 +342,7 @@ impl WordDocidsExtractors {
             max_positions_per_attributes: MAX_POSITION_PER_ATTRIBUTE,
         };
 
-        let thread_local = ThreadLocal::new();
+        let thread_local = ThreadLocal::with_capacity(rayon::current_num_threads());
 
         {
             let span =
diff --git a/milli/src/update/new/extract/searchable/mod.rs b/milli/src/update/new/extract/searchable/mod.rs
index 25f1eda14..a261efda3 100644
--- a/milli/src/update/new/extract/searchable/mod.rs
+++ b/milli/src/update/new/extract/searchable/mod.rs
@@ -60,7 +60,7 @@ pub trait SearchableExtractor {
             max_positions_per_attributes: MAX_POSITION_PER_ATTRIBUTE,
         };
 
-        let thread_local = ThreadLocal::new();
+        let thread_local = ThreadLocal::with_capacity(rayon::current_num_threads());
 
         {
             let span =