diff --git a/save_cache.go b/save_cache.go
index aec5ea1..52ddeab 100644
--- a/save_cache.go
+++ b/save_cache.go
@@ -124,7 +124,8 @@ func (r *cache) ServeHTTP(w http.ResponseWriter, req *http.Request) {
 			http.Error(w, "server error", http.StatusInternalServerError)
 			return
 		}
-		_, err = io.Copy(file, req.Body)
+		buf := [8 * 1024 * 1024]byte{}
+		_, err = io.CopyBuffer(file, req.Body, buf[:])
 		if err != nil {
 			log.Printf("io.Copy: %w", err)
 			http.Error(w, "server error", http.StatusInternalServerError)
@@ -142,7 +143,8 @@ func (r *cache) ServeHTTP(w http.ResponseWriter, req *http.Request) {
 			http.Error(w, "server error", http.StatusInternalServerError)
 			return
 		}
-		_, err = io.Copy(w, file)
+		buf := [8 * 1024 * 1024]byte{}
+		_, err = io.CopyBuffer(w, file, buf[:])
 		if err != nil {
 			log.Printf("io.Copy: %w", err)
 			http.Error(w, "server error", http.StatusInternalServerError)