[Observium] Slow page when accessing the Syslog message

Dears,

in my Observium, i have about 80M records in the  Syslog message.

When i want to access it via Observium - Syslog page, it take about 10-15 minutes.

My HW is : 8 GB RAM, 8 cores, HyperV

Would you be so kind to let me know, how can i tune it ? Also the other pages of Observium are quite slow

Thank you