High real memory

I have a droplet with wordpress installed The droplet has a high real memory load 0.00 (1 min) 0.15 (5 mins) 0.22 (15 mins) CPU usage 0% user, 0% kernel, 0% IO, 100% idle Real memory 805.31 MB used, 995.43 MB total

I just rebooted a few hours earlier. real memory was 123 mb afrer that.

Any ideas what is causing this?Or what log to check? thanks for any help.

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ok,thank you for your help

Apache consumes a lot of resources to process PHP.

Thank you. <br>I just begun with the droplet and has no traffic.I have memcache installed ,but still high.Php modules can cvause this maybe?