I'll second making a starter! I made my first one out of Wyeast 1056 for my last batch and it started fermenting about 4-5 hours after pitching. First time I brewed that batch, I didn't make a starter and it took about 2 - 2 1/2 days to show any signs of fermenting.
The easiest way I've seen to go about it this: 24 hrs. before I plan to brew I boil 1/2 cup light DME in 4 cups of water for 15 minutes. Cool it down to pitching temps, pour the wort into a sanitary jar (growler works great for me), pitch the yeast, cover with foil and shake it every time I walk past it or think about it. When it comes time to brew you can just dump the whole thing in there. I also figured that even if a 1L starter could technically be under pitching (depending on the OG and what beer you're brewing) it's better then not having a starter at all. They're easy enough to make and they eliminate that lag time you're seeing.
Here's a link to a great pictorial on how to make a starter. Only thing I do different is to boil the whole 1L volume (about 4 cups) of water before I pitch so I can avoid having to top off anything. More sanitary in my eyes. Good luck though.
https://www.homebrewtalk.com/f39/how-make-yeast-starter-pictorial-76101/