One option to reduce the module load time is to load only the cmdlets that you'll actually use.
For example, if you're not using 7-mode, you could load only the cmdlets matching *Nc* - running `Import-Module DataONTAP` took about 120ms more on my system than `Import-Module DataONTAP -Cmdlet *Nc*`. If you are using the Import statement as part of a script, or you use only a few cmdlets, you may want to mention them by name - that'll decrease the load time even further.
Another option to look at, would be your PSModulePath - if there are many entries there and the path to DataONTAP is near the end, that might explain some of the delay. Moving the path towards the beginning might speed up search and reduce the overall load time.
>> The version mis-match
There is a Data ONTAP PSTK version and a NetApp PSTK version. NetApp PSTK is the parent package of SANtricity and Data ONTAP PSTKs (not sure if any more have been added over the years). I suspect you downloaded NetApp PSTK 4.4, which packages Data ONTAP PSTK 4.2.