Am I missing out on better gains?

Hi All, So, I started to get serious about my retirement last year at 42 years old. I opened up a Roth IRA with Fidelity, and set it to auto pull and invest every Friday. This amount gets me to or very close to the limit for the year. I’m seeing now that most people are putting the entire chunk in at the beginning of the year. While I can’t really do this right now, and I assume that regular auto invests are better than nothing, just wanted to see if anyone had looked at hard numbers to see how big of a difference this will make over a 20 year period?