diff --git a/delphi/TESTMAIN.PAS b/delphi/TESTMAIN.PAS
index 77330b3..e6114ff 100644
--- a/delphi/TESTMAIN.PAS
+++ b/delphi/TESTMAIN.PAS
@@ -166,8 +166,9 @@ end;
 
 procedure TMainForm.Run;
 var
-  Msg: TMsg;
-  S:   string;
+  Msg:     TMsg;
+  S:       string;
+  HasData: Boolean;
 begin
   Show;
   FDone := False;
@@ -188,17 +189,28 @@ begin
     if FDone then
       Break;
 
-    { Poll serial data -- read one chunk, then yield to messages }
+    { Poll serial data -- read one chunk per iteration }
+    HasData := False;
     if FComm.PortOpen then
     begin
       S := FComm.Input;
       if Length(S) > 0 then
+      begin
         FAnsi.WriteDeferred(S);
+        HasData := True;
+      end;
     end;
 
     { Tick blink (dirties rows if interval elapsed), then render }
     FAnsi.TickBlink;
     FAnsi.FlipToScreen;
+
+    { Yield CPU to other apps when no serial data is flowing.          }
+    { PM_NOYIELD keeps message draining fast; Yield here gives other   }
+    { apps a timeslice only when idle.  During bulk data flow, HasData  }
+    { stays True and the loop runs at full speed.                      }
+    if not HasData then
+      Yield;
   end;
 end;
 
diff --git a/drv/commdrv.c b/drv/commdrv.c
index c935692..fca2538 100644
--- a/drv/commdrv.c
+++ b/drv/commdrv.c
@@ -1043,21 +1043,21 @@ static void initPortState(PortStateT *port, int16_t commId)
         trigKey[11] = 'E';
         trigKey[12] = 'R';
         trigKey[13] = '\0';
-        rxTrigger = readSystemIni("386Enh", trigKey, 8);
+        rxTrigger = readSystemIni("386Enh", trigKey, 1);
     }
     switch (rxTrigger) {
-        case 1:
-            port->fifoTrigger = FCR_TRIG_1;
-            break;
         case 4:
             port->fifoTrigger = FCR_TRIG_4;
             break;
+        case 8:
+            port->fifoTrigger = FCR_TRIG_8;
+            break;
         case 14:
             port->fifoTrigger = FCR_TRIG_14;
             break;
-        case 8:
+        case 1:
         default:
-            port->fifoTrigger = FCR_TRIG_8;
+            port->fifoTrigger = FCR_TRIG_1;
             break;
     }