depending on your nature of job, sometimes the converse is true,
especially if you are in sensitive position (eg: purchasing).
When I resigned from my previous job, my boss then was quick to
hire a replacement and for the notice period, I basically tekan the
new guy and do nothing the whole day.
I think its a "revenge" syndrome to pile you with work during your
notice period and its unprofessional given that in the job market,
resignations are part and parcels of office work.
Nonetheless, to maintain your professionalism, you'll cannot
totally slack off, so, just carry on with normal pace loh and if at
the last day you still cannot do it, heck it....you have resigned,
you owed the company nothing....