My Inspiron 5555 takes 3 minutes to start up. I used WinSAT in the command prompt and <g class="gr_ gr_128 gr-alert gr_tiny gr_spell gr_disable_anim_appear ContextualSpelling multiReplace" data-gr-id="128" id="128">i</g> got really high scores. This is the DXDIAG info.
https://drive.google.com/open?id=0B7GyhNi3hUMmbWdaOXVWY2k1dlE