diff --git a/src/tiledb/cloud/vcf/ingestion.py b/src/tiledb/cloud/vcf/ingestion.py
index 684c80744..5d4066cc0 100644
--- a/src/tiledb/cloud/vcf/ingestion.py
+++ b/src/tiledb/cloud/vcf/ingestion.py
@@ -39,10 +39,10 @@
 # Default values for ingestion parameters
 MANIFEST_BATCH_SIZE = 200
 MANIFEST_WORKERS = 40
-VCF_BATCH_SIZE = 10
+VCF_BATCH_SIZE = 100
 VCF_WORKERS = 40
 VCF_THREADS = 8
-VCF_HEADER_MB = 50  # memory per sample per thread
+VCF_HEADER_MB = 32  # memory per sample per thread
 
 # Consolidation task resources
 CONSOLIDATE_RESOURCES = {