The moment when… your heated bed is actually one minute faster than your E3D-V6…
https://youtu.be/NzeJseW9LTs
I wish my bed would heat up this fast.
220V silicone heater?
220V silicone heater! 
Crazy my bed takes like 5x’s longer to heat up than the extruder!
It is 0.6W/cm², 4mm PEI-coated aluminium printbed. In the video, PID_i_max is set at 64 of 255 in smoothieware, thats why it is so slow heating at the end to prehend overshooting. Needs a little higher setting, currently I am testing with 128/255 and it looks like that it shoots on point imidiately now.
Once you had a silicone heater, you would never change back 
while it is obvious, that it is not the silicone that heats @Mark_Rehorst it’s the fact, that using a silicone heater has sooooo much more advantages over all other heaters used in 3d-printers than heating power alone. You can glue it on, it is flexible and therefore doesn’t bend the printbed, is is available for really cheap in nearly all shapes, sizes and powerconfigurations and therefore will fit nearly every printer, it can use main-voltage to get a better Efficiency, you can even order kevlar-inserts to protect against accidental damage.
Platforms that heat too quickly tend to go through cycles of thermal expansion and bowing that are detrimental to print quality. Platform heaters aren’t driven by any type of reasonably fast PWM, so they’ll heat for a while and then stop heating. When they do this the center heats quickly and expands more than the edges (which are losing more heat to the air), and this make the platform bow. As it reaches temperature, the heat conducts through the material, and the heater shuts off to keep from getting hotter that the desired temperature, this temperature differential decreases and the platform gets flatter. On printers that go through this cycle too quickly, you can usually see banding in the prints because the whole print is being shifted up and down relative to the position of the Z axis as it happens.
This was only crucial on materials, that are not good at conducting heat, like old 'n ugly PCB-heaters or e.g. CF-sheets. This siliconeheater on the other hand is glued on highly conductive aluminium and on top of this, it is a special heat-treated and slowcooled alumium to prevent any thermal issues even more. I even did a thermovision, it stated max delta of <5°C during heat up all across 30x30cm. A much bigger impact (talking of <0.1mm) would be: screwing the printbed tight, because of thermal expansion and even measured this, too
And I forgot: It is still a PWM-sourced heater, but only 20Hz. Bang-Bang is soooo 2010