diff --git a/solr/CHANGES.txt b/solr/CHANGES.txt
index a6519e0f57b..6f8c449eae2 100644
--- a/solr/CHANGES.txt
+++ b/solr/CHANGES.txt
@@ -252,6 +252,8 @@ Improvements
 
 * SOLR-12892: MapWriter to use CharSequence instead of String (noble)
 
+* SOLR-12882: Eliminate excessive lambda allocation in json facets FacetFieldProcessorByHashDV (Tim Underwood)
+
 ==================  7.5.0 ==================
 
 Consult the LUCENE_CHANGES.txt file for additional, low level, changes in this release.
diff --git a/solr/core/src/java/org/apache/solr/search/facet/FacetFieldProcessorByHashDV.java b/solr/core/src/java/org/apache/solr/search/facet/FacetFieldProcessorByHashDV.java
index 4c0b244c1dd..c246c210217 100644
--- a/solr/core/src/java/org/apache/solr/search/facet/FacetFieldProcessorByHashDV.java
+++ b/solr/core/src/java/org/apache/solr/search/facet/FacetFieldProcessorByHashDV.java
@@ -430,12 +430,20 @@ class FacetFieldProcessorByHashDV extends FacetFieldProcessor {
     // Our countAcc is virtual, so this is not needed:
     // countAcc.incrementCount(slot, 1);
 
-    super.collectFirstPhase(segDoc, slot, slotNum -> {
-        Comparable value = calc.bitsToValue(val);
-        return new SlotContext(sf.getType().getFieldQuery(null, sf, calc.formatValue(value)));
-      });
+    super.collectFirstPhase(segDoc, slot, slotContext);
   }
 
+  /**
+   * SlotContext to use during all {@link SlotAcc} collection.
+   *
+   * This avoids a memory allocation for each invocation of collectValFirstPhase.
+   */
+  private IntFunction<SlotContext> slotContext = (slotNum) -> {
+    long val = table.vals[slotNum];
+    Comparable value = calc.bitsToValue(val);
+    return new SlotContext(sf.getType().getFieldQuery(null, sf, calc.formatValue(value)));
+  };
+
   private void doRehash(LongCounts table) {
     if (collectAcc == null && allBucketsAcc == null) return;