i have two serious bugs on my cart and i have no idea what to do about them. they keep getting worse and worse and i dont know how!!

first, customers are being logged in as other customers. they put stuff in their cart and come back and they are suddenly in another customers cart and their stuff is gone. this is happening to almost EVERYONE who comes now.

the cart is also INCREDIBLY slow. i use dreamhost, and all sites hosted on the same server work just fine - only the cart is very, very slow (taking minutes to load one page).


please, help me!! i have no skills in programming and i am at a loss as to what to do. now nobody will order anymore because these two problems together are too terrible. please, HELP!