To improve speed on 64-bit systems, you can increase the memory allocated to the client by modifying the jvm.properties file, changing -Xmx256m to a higher value like -Xmx768m .
: The client is a 32-bit executable. On 64-bit Windows, it installs by default into the C:\Program Files (x86)\ directory. Compatibility lotus notes client 8.5 3 64 bit download