1 files changed, 2 insertions, 2 deletions

diff --git a/gopherproxy.go b/gopherproxy.go
index 0ecfa14..0134f88 100644
--- a/gopherproxy.go
+++ b/gopherproxy.go
@@ -242,7 +242,7 @@ func FontHandler(woff2 bool, fontdata []byte) http.HandlerFunc {
 // specified by the request. The robots argument is a pointer to
 // a robotstxt.RobotsData struct for testing user agents against
 // a configurable robots.txt file.
-func ListenAndServe(bind, robotsfile string, robotsdebug bool, uri string) error {
+func ListenAndServe(bind, robotsfile string, robotsdebug bool, vipsconcurrency int, uri string) error {
         var (
                 tpl        *template.Template
                 robotsdata *robotstxt.RobotsData
@@ -329,7 +329,7 @@ func ListenAndServe(bind, robotsfile string, robotsdebug bool, uri string) error
         }
 
         vips.Startup(&vips.Config{
-                ConcurrencyLevel: 0,
+                ConcurrencyLevel: vipsconcurrency,
         })
 
         http.HandleFunc("/", GopherHandler(tpl, robotsdata, AssetHashList{stylehash, jshash, fontwhash, fontw2hash}, robotsdebug, uri))