Erpnext performance is slow

i had my erpnext running in digital ocean cloud with 1 GB RAM , 25 GB HDD
the server runs three erpnext subdomains example

the servers memory available is

the HDD available is 4.7 GB out of 25 GB

how to increase the performance of erpnext , is the memory and HDD affects the performance in this issue ? any clues to improve the performance

The minimun recomended is 4Gb Ram 2 Cores


You may find that will get errors when running bench commands with this amount of memory, which is considered low.