Hi,
have you "cleaned" your plancache, and your statistics?
Have you checked your waits during / after the test?
What about the execution plans from your queries?

Have you...

Hm,
I think this should be 20% and 500 Row.
Not 500 Rows + 20%

And than, your 50k records won't auto update your statistic.
Take a lock at...

Hi,
have you checked your windows performance counter for the network interface card (nic)
If there was some kind of error, you should see something in the counters.
Kind regards,

It there no admin online to block this fu... account: "rtgfbhsrtjfr3"
He is posting spam a few seconds ago.
Best regards,
Andreas

Hi,
you can use an udl file:
https://blogs.msdn.microsoft.com/farukcelik/2007/12/31/basics-first-udl-test/
It is quite simple to use
best regards,
Andreas

Hi,
if you use standard edition:

Hi,
use min max memory settings to use much ram as possible. But let some ram for the os , I think you shold set the max memory to ...

Hi,
please show us the ERRORLOG from the sql server.
Sometimes VEEAM snapshots create some frozen messages in the SQL ERRORLOG.
Maybe this could be the rout cause of your...

Hi,
please post your t-sql code  you  create until now.
And show us the create script of the tables you use.

With this kind of discription, no one could...

Hm,
but if you rebuild an index, the new...

Hi,
how many publisher (Server) do you use, and how many distribution databases do you have?
If you only got 1 distribution database, then there maybe a lot of blockings....

Hi,
you can delete data / rows at the subscriber,
BUT,
if you had to create a new snapshot, maybe for some new article or  transactional replication ist broken, all...

Hi,
do you use  single windows logins, or windows group logins on the sql server?
Best regards,
Andreas