Welcome to the forum.
What are the specs. of the video files from that Canon?
What Project Preset did you choose at New Project?
Per canon manual, clips are MOV (Image: H.264; Audio: Linear PCM (stereo))
Per properties on PC, here is what it says:
Camera clips are .MOV
video 1920 x 1080
data rate 33478
23 frames per sec
Audio 2 sterio,
DSLR, 1020 x 1080, 24fps
Note that the window came up asking if I want to put my project settings the same as the video clip,
and I answered yes, so i think the settings in premiere are good by selecting taking the recommended settings.
Thanks. Is that FPS correct? I would expect 23.976. Now, PrE does not do well with 24p material, and there can be some slow-downs, when dealing with "film look" material.