OK
Plugging those numbers into Gwizard running conservative speeds
Depth of cut (DOC) .05
Width of cut (WOC) .25
Feed rate (IPM) 103
Plunge rate 51
Now with the stock spindly spindle that X-Carve ships with you will never get the that feed rate. You may improve things a bit if you can reduce your tool stick out to 1" or better.
If I am reading @BillArnold correctly you are limited to .5" of your tool fitting in the collet before it bottoms out. That is not good.
Also as Bill said a 1/8" end mill that is much shorter and has half the WOC your 1/4 has would work better. You would just need to change the tool paths in what ever CAM program you are using.
Gwizard slows the feed rate down to 74 IPM. Your spindle speed is only giving a surface speed (SFM) of 458 where as the mfg’s surface speed call for 1500.
That translates to close to 50,000 RPM for the spindle and you could travel at 110 IPM if you had that kind of spindle speed. Don’t know of a spindle that will move that fast but a trim router in place of you stock spindle that will do 30K would be a vast improvement.
Ow and loose the pine worst wood in the world 
Dave