Very Slow Site Response

Dear All,
I would like to say thanks for all.
Let me explain our environment first then move on to the queries.
Environment: We have one SharePoint 2013 application VM
windows 2012 server, two web front end VM Windows 2012 server and dedicated SQL physical server.  The SP VM has 2*vCPU (2core) and 16 GB of physical memory, DB has 2*CPU (8core) and 16GB of RAM.  All servers are connected via 1 GB connection.  Intranet
is connected via 100 Mb link and for internet via 5Mbps ISP.
Farm Configuration:
Both front end servers had Managed metadata service and distributed cache service
Application server had CA (basic service) and managed metadata service, there was no excel, Visio and other service. 
Site: We are developed custom webpart and all other stuff
like design at all.  The average page size is 1.5Mb.  The site was extended to intranet and internet (anonymous) zones.  We are already configured BLOB cache, object cache and output cache.
Clarification & Queries:
While we are doing the load test in intranet site by 300 Concurrent user in the LAN (i.e 100 Mbps). It getting very slow and "Service Unavailable" error.  Please, why
the servers are not supporting 300 concurrent users?
While we are performing the test, the network traffics are received from client (test agent) to WFE and send to DB. Please, Why the page cache and object caches are working or not?
If the site will opened to internet, how the site and server are react to users?
Please give us you needful help. 
FYR please look on to the load test summary https://social.technet.microsoft.com/Forums/getfile/579571 
Thanks in advance.
Regards,
Sathiya

1) As a rule of thumb a SharePoint server can support in the region of 100 active users per SharePoint server. 300 is within the realm of expectations, depending on test content and definitions of active. You haven't mentioned the CPU load or the amount
of memory paging you're seeing on the servers during the test. I would expect them to be maxed out on one or more of your servers? Note that RAM load isn't directly helpful as SharePoint is a greedy application and may be using all of it at very low load levels.
2) Caching reduces the traffic but does not eliminate it. You're looking in the wrong place to see if the page cache is active. From memory you need to examine HTTP headers to verify if page caching is active or not.
3) In what sense?
4) No problem.
The link you posted is broken.
Finally you describe this in the title as 'very slow site response' which is not what you're describing in the text (fairly well) which is better described as a lower than hoped level of concurrency. Are you also getting slow response times at lower load?
Really finally: You've posted this in the wrong forum, this is a search specialist sub forum. You would get more notice and assistance in the general forum for this thread. Hopefully a moderator can move it for you...

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