I'm having performance issues between windows server 2008 64 firebird 1.5 and when to apply the system begins to be used by User The i/o disk server consumes 100%

Server Description

- Quad-core Xeon
- 8 gb of ram
- 500 gb sata hard
- Server 2008 r2 64-bit
- firebird 1.5

someone has suggested

thank you