Upgrading from solr1.3 to solr1.4

[Rakhi Khatwani]

Hi,
       i have indexed some data on solr 1.3.0. Now i wanna upgrade to solr
1.4.0 but on the same data.
so here are the following steps i performed:
1. extract solr 1.4.0
2. copied the conf and data folder of my index from solr
1.3.0/examples/multicore to solr1.4.0/examples/multicore/
3. started the multicore server.
but my queries on the index takes longer than with solr 1.3.0
any suggesstions??
Regards,
Raakhi