Don't skip signature check steps if server is lagging

src/d_clisrv.h

@@ -620,6 +620,9 @@ void CL_TimeoutServerList(void);
 // Is there a game running
 boolean Playing(void);
 
+// Advance client-to-client pubkey verification flow
+void UpdateChallenges(void);
+
 // Broadcasts special packets to other players
 //  to notify of game exit
 void D_QuitNetGame(void);

src/p_tick.c

@@ -28,6 +28,7 @@
 #include "i_video.h" // rendermode
 #include "r_main.h"
 #include "r_fps.h"
+#include "d_clisrv.h" // UpdateChallenges
 
 // Object place
 #include "m_cheat.h"
@@ -966,6 +967,9 @@ void P_Ticker(boolean run)
 		ps_lua_thinkframe_time = I_GetPreciseTime() - ps_lua_thinkframe_time;
 	}
 
+	if (run)
+		UpdateChallenges();
+
 	// Run shield positioning
 	P_RunOverlays();