diff --git a/app/proxyman/outbound/handler.go b/app/proxyman/outbound/handler.go
index fe43c429f..4c3b16a12 100644
--- a/app/proxyman/outbound/handler.go
+++ b/app/proxyman/outbound/handler.go
@@ -122,8 +122,8 @@ func NewHandler(ctx context.Context, config *core.OutboundHandlerConfig) (outbou
 			if config.Concurrency < 0 {
 				h.mux = &mux.ClientManager{Enabled: false}
 			}
-			if config.Concurrency == 0 {
-				config.Concurrency = 8 // same as before
+			if config.Concurrency >= 0 && config.Concurrency <= 128 {
+				config.Concurrency = 128
 			}
 			if config.Concurrency > 0 {
 				h.mux = &mux.ClientManager{
@@ -134,7 +134,7 @@ func NewHandler(ctx context.Context, config *core.OutboundHandlerConfig) (outbou
 							Dialer: h,
 							Strategy: mux.ClientStrategy{
 								MaxConcurrency: uint32(config.Concurrency),
-								MaxConnection:  128,
+								MaxConnection:  1024,
 							},
 						},
 					},
@@ -155,7 +155,7 @@ func NewHandler(ctx context.Context, config *core.OutboundHandlerConfig) (outbou
 							Dialer: h,
 							Strategy: mux.ClientStrategy{
 								MaxConcurrency: uint32(config.XudpConcurrency),
-								MaxConnection:  128,
+								MaxConnection:  1024,
 							},
 						},
 					},