Ask a table with two websites in a database

I purchased a virtual host with only one database some days before I put tables on two websites. now I want to put data on two or three websites, will this affect the access speed? will it be irrelevant to the number of tables that are stored, but it is related to the number of users who query the database and the query speed. therefore, if many people visit websites with large data volumes and frequent database operations, the access will certainly be affected ., There will be no tables on two websites in one database.
A few days ago, I bought a virtual host with only one database. now I want to store data for two or three websites. Will this affect the access speed?

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Will it have nothing to do with how many tables are put?
It depends on the number of people who query the database and the query speed.
Therefore, if many people visit websites with large data volumes and frequent database operations, the access will certainly be affected.

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Mysql is very efficient.
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Theoretically, it will not be affected, but the virtual host may be affected by the bandwidth.
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It is mainly related to the brute force attack on this VM ....