"Minimal effort" means doing the least amount of work or using the least energy possible to accomplish a task or achieve a goal. It suggests a lack of enthusiasm or dedication. Full definition
Having driven a Golf R with this gearbox, I can say it offers absolutely smooth shifts with minimal effort with positive engagements in each position. (topspeed.com)
Doing so requires minimal effort on your part, other than to be aware of the most desirable keywords in your field. (job-hunt.org)
Although this does get the job done with minimal effort on your part, your chances of getting noticed will be slim. (resume2016.com)