Website we host is slow to respond when submit button hit, some of the time

We are using a web product called Sage ESS.  When employees submit things like time off requests it sometimes takes up to a minute for the system to respond.  If the employee is inpatient and hit submit several times, then several requests go through.  Other times the server responds right away.  I have looked at the processes on the server and find no issues at all when these slowdowns occur.  I have found one error in the event viewer, event 36874, Schannel.  A TLS 1.2 connection request was received from a remote client application, but none of the cipher suites supported by the client application are supported by the server.  The SSL connection request has failed.  This is on a Windows 2012 standard server, it is up to date with all updates.  What should I look at to find the root of this issue?
PDISAsked:
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Dan McFaddenSystems EngineerCommented:
The error states that the client wants to start a TLS 1.2 (SSL connection)  with a specific cipher but the server either has that cipher disabled or does not support it at all.

I recommend taking a look at IIS Crypto to see what active or disabled on the server.

link: https://www.nartac.com/Products/IISCrypto

Do you have http logging enabled for the website?
-> if not, please enable logging and all W3C fields for the log
---> if you do have logging running, can you post a portion of the log where you know a file is being uploaded?  10-20 lines before the upload and 10-20 after please.

Are there any IIS errors in any of the server event logs?

Dan
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