diff --git a/internal/goofys.go b/internal/goofys.go
index 469d7997..3dea2245 100644
--- a/internal/goofys.go
+++ b/internal/goofys.go
@@ -255,6 +255,11 @@ func newGoofys(ctx context.Context, bucket string, flags *FlagStorage,
 		Mtime: now,
 	}
 
+	if os.Getenv("GOGC") == "" {
+		// Set garbage collection ratio to 20 instead of 100 by default.
+		debug.SetGCPercent(20)
+	}
+
 	fs.bufferPool = NewBufferPool(int64(flags.MemoryLimit), uint64(flags.GCInterval) << 20)
 	fs.bufferPool.FreeSomeCleanBuffers = func(size int64) (int64, bool) {
 		return fs.FreeSomeCleanBuffers(size)