1) Reduce WSS_Logging size by limiting the retention from 14 days to 1 day:
Paste the script below in the SharePoint Management Shell:
Set-SPUsageDefinition -Identity "Analytics Usage" -DaysRetained 1
Set-SPUsageDefinition -Identity "App Monitoring" -DaysRetained 1
Set-SPUsageDefinition -Identity "Bandwidth Monitoring" -DaysRetained 1
Set-SPUsageDefinition -Identity "Definition of usage fields for service calls" -DaysRetained 1
Set-SPUsageDefinition -Identity "File IO" -DaysRetained 1
Set-SPUsageDefinition -Identity "REST and Client API Action Usage" -DaysRetained 1
Set-SPUsageDefinition -Identity "REST and Client API Request Usage" -DaysRetained 1
Set-SPUsageDefinition -Identity "Sandbox Request Resource Measures" -DaysRetained 1
Set-SPUsageDefinition -Identity "Sandbox Requests" -DaysRetained 1
Set-SPUsageDefinition -Identity "Content Import Usage" -DaysRetained 1
Set-SPUsageDefinition -Identity "Content Export Usage" -DaysRetained 1
Set-SPUsageDefinition -Identity "Page Requests" -DaysRetained 1
Set-SPUsageDefinition -Identity "Feature Use" -DaysRetained 1
Set-SPUsageDefinition -Identity "Timer Jobs" -DaysRetained 1
Set-SPUsageDefinition -Identity "SQL Exceptions Usage" -DaysRetained 1
Set-SPUsageDefinition -Identity "SQL IO Usage" -DaysRetained 1
Set-SPUsageDefinition -Identity "SQL Latency Usage" -DaysRetained 1
Set-SPUsageDefinition -Identity "Task Use" -DaysRetained 1
Set-SPUsageDefinition -Identity "Tenant Logging" -DaysRetained 1
Set-SPUsageDefinition -Identity "App Statistics." -DaysRetained 1
Set-SPUsageDefinition -Identity "User Profile ActiveDirectory Import Usage" -DaysRetained 1
2) Reduce the Search indexation priority (NodeRunner.exe)
Paste the script below in the SharePoint Management Shell:
Set-SPEnterpriseSearchService -PerformanceLevel Reduced