What i did when i start host server was host server on same pc i drive with.
Dedicated server takes 50 % of my cpu AMD , and when i start rfactor and join my own server all drivers in the server get high ping because i host server on same pc i also should run rfactor with.
I just used same username to host and play with and i only have 1 pc and no router so i give up host server.
After 6 months i get a better faster pc so i think that i may testing host server again, now i have 2 pc so i setup pc 2 slower pc to host server the problem i get now was that i must use a router so both pc can have internet.
Now it have come out a better dedicated exe called SD so i start a server and amd cpu takes only 2 % for dedicated exe great i open rfactor ports in router and test joining server from pc 1.. succes

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I get 10 ping when i check in game and behind dedicated server i see ping 2 nice. so i host server like that for 3 4 weeks.
Then i start test what is possible host servers. i not have so good upload then only 1 MB , so i start tweaking the multiplayer ini file so the server should be respond better.
I found that if i edit Max Data Per Client="128" // that not drain my upload speed makes servers laggy. i also see that on dedicated server % upload when that was over 75-80 % servers start lagging with 10 drivers on server.
So important thing is cpu offcourse but more the upload speed i get checking % upload that deicated server say to see how many drivers i can allow on my server.
2 months after that test i get better upload 3 MB great i can maybe host more then 1 server now i test with 12 servers
But my router was bad in that case i must open 3 items per server ! router only allowed 20 items how do now ?
I test edit ports i have add for 1 server with start and end port 12 nr higher on all 3 items 34447 i use on pc 1 that i drive with so i set for pc 2 34448 start port and end on 34460
here
And test great all servers i could join with just add 3 items

but servers could not joined by ip only from lobbylist.
Then after 1 year i could update my speed more with fiber cable 100/10 MB.
Now servers take less % upload with 25 drivers in server it takes 25 % i use that for 6 months.
Then i upgrade upload speed to 100 MB now a server have 1% upload with 25 drivers on it so the upload speed help much still router and drivers could only join from lobbylist.
Last week i test with a switch instead of router wow all problems with use a router was gone no limit open items in a router so now drivers can enter by ip.
O this message was long anyway the upload speed is the main thing host server and low upload speed edit Max Data Per Client="128" to 64 48 32 and test server i always set server in custom mode not Lan or Dsl.
See more in the post here usefull tweaking in rfactor
https://community.racesimcentral.ne...-usefull-in-Tweaking-rfactor?highlight=tweaks
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Good luck