Heat is from the processor and not the drive so no difference in heat.
Well, because the hdd becomes very hot after some use - 56┬░C is normal here - I would say a cool drive could make a difference. If the ssd would be araound 30┬░C there should be lesser heat on the system so the cpu could be cooler too because there is no heating from the drive anymore.
Read write times to a good SSD are much faster and overall performance should improve considerably. Still limited to 1gig of ram so if it is memory issues that is causing the pauses the SSD will have little impact.
I would like to use the SuperTalent GF MLC SSD. 40/80 MB/s schould be much faster then the harddrive, but dont know the limitations of the hardware interface on the Achos 9.
But also if the RAM is the probelm a SSD should give a boost because the swap file should be faster too.
But I dont know if RAM or harddrive the problem on handwriting or just the slow CPU.