Assuming 6 minutes per MegaByte and 100 list members, a 1,000,000 byte file will take ten hours to transmit. Most people on the lists will know you only by what you say and how well you say it. They may someday be your co-workers or friends. Take some time to make sure each posting is something that will not embarrass you later. Minimize your spelling errors and make sure that the article is easy to read and understand.
Writing is an art and to do it well requires practice.
Since much of how people judge you on the net is based on your writing, such time is well spent. The subject line of an article is there to enable a person with a limited amount of time to decide whether or not to read your article. Tell people what the article is about before they read it. Don't expect people to read your article to find out what it is about because many of them won't bother. Some sites truncate the length of the subject line to 40 characters so keep your subjects short and to the point.