Ok lets answer a little.
1. Admin do read comments but you have to be patient with a lot of things, others have been answered repeatedly before and could just use a search.
2. Getting 100 points is not the limit for getting a credit, the actual limit is top 1/3rd of the players. So if 1500 people finish you want to be inside the top 500. This does often mean getting ~100 points, but it's not guaranteed, I personally aim for ~110+ to make sure of getting a credit nowadays.
3. I've personally not seen the game slow down at all. Possible causes:
Your isp may have put limits on certain ports, I've personally seen this for other games with my isp. Phone up/email and whinge about getting your ports unblocked.
Your countries isp's may have trouble connecting with the servers, if this is the case time will be the healer.
You may have virus's/spyware/malware uploading information and chugging up your line.
There will be more reasons but these seemed the most obvious to me in this sleep deprived state.
If it's just one day so far it's probably temporary and waiting a little will solve it.