I installed Openerp 7 in Ubuntu VPS server. My VPS plan is 

• 16GBMemory
• 8 CoreProcessor
• 160GBSSD Disk
• 6TBTransfer

In my VPS,  memory allocated is :

#free -m
             total       used       free     shared    buffers     cached
Mem:         16049       7438       8610          0        192        807
-/+ buffers/cache:       6439       9610

disk size is:

# df -h
Filesystem      Size  Used Avail Use% Mounted on
/dev/vda         79G  7.0G   68G  10% /

But I am getting too slow when using Openerp. My internet connection is ok. we have only 15 openerp users. Could youp please help me?