website very slow

[sergio saldaña]

Hi

I have a web site... its the first time that I have a web so big... I'm having problems on my website with the speed. I dont know if it is about the server or a problem with my bbdd...

The 3 tables more bigger have this size:

Table 1
-------------------
Data length 78.5 mb
Index length 12,5 mb

Table 2
-------------------
Data length 438.9 mb
Index length 277 mb

Table 3
-------------------
Data length 31 mb
Index length 55 mb

The speed is bad with 30 users... not much... This is provably only problem with my bbdd or u think that it should be better?

Please i need help, i am hopeless