I have saved a bookmark in my main browser. When I am not on my normal personal laptop, the link also is always available at the top right of Church web pages under the nine-dot drop down menu just above your user name.
With those two links readily available, it has not taken me more than two minutes to donate in over a year. There may be some slowing if you try to donate during rush hour on Sunday morning, Utah time, but I usually hit the site during the week to avoid that problem.