This lacks a lot of information to increase the chance for a helpful statement.
What is the script doing but sending a mail?
What means "more"? What was "before", ie. what changed?
If this script is just sending a mail, maybe stop bit coin mining on that box to reduce the performance bottleneck
If the script is performing several steps, identify the slow ones by writing a logfile with timestamps to get a clue what takes so long.
If the script is doing SQL-Statements like in your former posts, contact a DBA and check with him/her, what is going wrong/slow. Maybe some tables/indices etc. changed or resources like CPU/RAM/Storage/Network have been reduced/slowed or someone else is using the host the script is running on, or a possible DB-server extensively.