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MBAM + Visual Studio 2017 output logging = massive lag

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Hi guys,

I notice lag when closing my application in visual studio, further investigation resulted in logging info to the output window of visual studio to be the culprit.

Attached you will find a simple visual studio 2017 project, that contains a winmain that will send 100 messages to the debuggers output window, and then measure the time this took.
If you run this with ransomware protection ON, than it takes 500ms (on my system), and if you run it with ransomware protection OFF, it only takes 6ms!!!

Since I spend most of my day in visual studio, I can now no longer use the ransomware protection, as it creates major annoying lag moments.

Please investigate what is going wrong here with the ransomware detection!

Kind regards,

Used software is Visual Studio Enterprise on Windows 10 with Malwarebytes Premium v3.5.1.

Here is the winmain.cpp code, in case you rather create your own project:

#include <windows.h>
#include <stdio.h>
#include "mmsystem.h"
#pragma comment( lib, "winmm.lib" )

int WINAPI WinMain(	HINSTANCE hinstance, HINSTANCE hprevinstance, LPSTR lpcmdline, int ncmdshow)
	// Start the timer
	timeBeginPeriod( 1 );
	unsigned long startTime = timeGetTime();

	// Send a lot of messages to the output window of visual studio
	char outputMsg[255] = "\0";
	int testSize        = 1000;
	for (int msg = 0; msg < testSize; ++msg)
		sprintf_s( outputMsg, 255, "Dummy output msg %4d\n", msg+1 );
		// Compile a msg
		OutputDebugString( outputMsg );

	// End the timer
	unsigned long endTime = timeGetTime();
	timeEndPeriod( 1 );

	// Show result
	char result[255] = "\0";
	sprintf_s( result, 255, "Sending %d messages to VS output took %d ms", testSize, endTime-startTime );
	::MessageBoxA( NULL, result, "MBAM output test result", MB_OK );

	// Done
	return 0;



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  • 1 month later...


It's not limited to VS 2017. This is what happens on VS 2015:

The below segment of C# code takes 60949 ms to run with MalwareBytes ON. With Malwarebytes OFF, it takes 345 ms.

DateTime dtThen = DateTime.Now;
for (int i = 0; i < 1000; i++)
	Debug.WriteLine("Iteration {0}", i);
DateTime dtNow = DateTime.Now;
Debug.WriteLine("Total time taken: {0}", (dtNow - dtThen).TotalMilliseconds);

It appears to be anytime Visual Studio and the attached debugged application communicate, either via output window writing or call stack/exception/variable inspection.

We use Malwarebytes Endpoint Protection, so the developers don't have the option of turning off just ransomware protection, they can only stop the whole MBAMService.

Please let us know if there is a workaround other than disabling the service entirely, or if/when the problem will be resolved?



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