rtsp-sink(RTSPStreamer) DirectShow.Net filter based RTSP server causes high latency in complete network and even slowdown the network speed by 90% - c++

Question

Ref: I have a RTSP media server that sends video via TCP streaming.I am using rtsp-sink(RTSPStreamer) DirectShow.Net filter based RTSP server which is developed in C++.Where as The Wrapper app is developed using C#.
The problem i am facing is the moment RTSP server start streaming,it affects the system level internet connection & drops internet connection speed by 90 percent.
I wanted to get your input on how it would be possible? (if at all).Because it impacts on system level internet connection not the very app level.
For Example:- My normal internet connection speed is 25 mbps. It suddenly drops to 2 mbps , whenever the RTSP streaming started in the app's server tab.
Sometimes even disables the internet connection in the system(Computer) where the app is running.
I'm asking you because I consider you an expert so please bear with me on this "maybe wild" question and thanks ahead.
...of all the things I've lost, I miss my mind the most.
Code Snippet of RTSPSender.CPP
//////////////////////////////////////////////////////
// CStreamingServer
//////////////////////////////////////////////////////
UsageEnvironment* CStreamingServer::s_pUsageEnvironment = NULL;
CHAR CStreamingServer::s_szDefaultBroadCastIP[] = "239.255.42.42";
//////////////////////////////////////////////////////
CStreamingServer::CStreamingServer(HANDLE hQuit)
: BasicTaskScheduler(10000)
, m_hQuit(hQuit)
, m_Streams(NAME("Streams"))
, m_bStarting(FALSE)
, m_bSessionReady(FALSE)
, m_pszURL(NULL)
, m_rtBufferingTime(UNITS * 2)
{
s_pUsageEnvironment = BasicUsageEnvironment::createNew(*this);
rtspServer = NULL;
strcpy_s(m_szAddress,"");
strcpy_s(m_szStreamName,"stream");
strcpy_s(m_szInfo,"media");
strcpy_s(m_szDescription,"Session streamed by \"RTSP Streamer DirectShow Filter\"");
m_nRTPPort = 6666;
m_nRTSPPort = 8554;
m_nTTL = 1;
m_bIsSSM = FALSE;
}
Edited:WireShark logs:
WireShark logs at the time of RTSP streaming started