Fatal error: Allowed memory size of .......

Salve,
come da oggetto il mio sito con Tema Avada dà questo problema, come posso fare per aumentare le performance come indicato sotto?
grazie in anticipo

Citazione:

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WP Memory Limit: [?] 40 MB - We recommend setting memory to at least*128MB.*
To import classic demo data,*256MB*of memory limit is required.*
Please define memory limit in*wp-config.php*file. To learn how, see:*Increasing memory allocated to PHP.

PHP Time Limit: [?] 30 - We recommend setting max execution time to at least 180.*
To import classic demo content,*300*seconds of max execution time is required.
See:*Increasing max execution to PHP

WP Remote Get: [?] wp_remote_get() failed. Some theme features may not work. Please contact your hosting provider and make sure that http://avada.theme-fusion.com/test.php is not blocked.

WP Remote Post: [?] wp_remote_post() failed. Some theme features may not work. Please contact your hosting provider and make sure that http://avada.theme-fusion.com/test.php is not blocked.

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Per il primo, non sta rilevando il valore corretto: il limite di memoria è 128MB, il limite di esecuzione è al più aumentabile fino a 60 secondi. Per quanto riguarda le connessioni esterne devi sbloccare la whitelist.