Bad performance with 1.4.0.8

Hi,
not sure if I am using the right mail-address here.
I installed dosemu 1.4.0.8 as found in the repository of Kubuntu 14.04. 
I am using a thinkpad with 2,6Ghz dual-core.
But now I found out, that may old TP with 1,6Ghz single Processor Ubuntu 
10.04 and dosemu 1.4.0.1 is around
3 times faster !! even with this obsolete HW. Doing a query at my old 
DOS-database, it uses with the 'fast'  system
around 12s, where the old configuration needs only 4s. I am wondering, 
if dosemu 1.4.0.8 may be the culprit, or
if Dosemu has problems with this dual-core processor or with that new 
linux-kernel.
I did not yet try to install 1.4.0.1  manually, to check if the dosemu 
version may be the culprit.

Thanks and regards
Dietmar Schoch