diff --git a/compute.go b/compute.go
index 1119f92..33e689c 100644
--- a/compute.go
+++ b/compute.go
@@ -33,7 +33,7 @@ type ComputeOptions struct {
 func NewComputeOpts() ComputeOptions {
 	return ComputeOptions{
 		Algorithm:   AlgoMPX,
-		Parallelism: runtime.NumCPU() * 2,
+		Parallelism: runtime.NumCPU(),
 	}
 }