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most colts have a very substantual mainspring and the first thing i would check would be the ammo. try some factory loads and see if it makes a difference. it's a whole different story if a previous owner had some work done.
however, the colt mainspring is much easier to replace than a smith or ruger...there's only one spring involved.
1. get a replacement mainspring (colt d-frame)
2. unload the gun
3. take off the grip panels
the main spring is the v-shaped leaf spring that sits horizonally in the frame.
4. compress the leafspring (i use a set of needle nose pliers) until the upper hooks clear the hammer strut
5. slide leafspring out sideways
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