How to increase Memory in Sybase and which parameter should affect ?

Hello All,

I want to increase Memory in ASE Sybase 15.7

Which parameter should require to reconfigure ?

Right now we have 48 GB Memory in Server and 21 GB allocated to Sybase DB but we are facing too slow in pick hours. planning to 16 GB increase and want to allocate 12 GB for Sybase but don't know how to reconfigure

Current Configuration

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OS - Windows Server 2008 R2

SAP - ECC6 EHP6

SAP Users - 900

Max Memory - 11320000 (2K)

Total Logical Memory - 3158101 (2K)