Mac muito lento. Alguma dica para arrumar???

Diagnosticado também pelo EntreCreck Pro, o relatório abaixo:

EtreCheck version: 6.2.3 (6C010)

Report generated: 2020-03-29 22:03:40

Download EtreCheckPro from https://etrecheck.com

Runtime: 14:14

Performance: Poor

Problem: Computer is too slow

Description: 

Imac Is too slow for running programs, photos, everything

Major Issues:

    Anything that appears on this list needs immediate attention.

    Poor performance - EtreCheck report shows poor performance. This is unusual.

    Software/hardware problems - Software is causing performance problems.

    Apps crashing - There have been numerous app crashes.

    Unsigned files - There are unsigned software files installed. Apple has said that unsigned software will not run by default in a future version of the operating system.

    32-bit Apps - This machine has 32-bits apps will not work on macOS 10.15 "Catalina".

    Sharing enabled - This machine has sharing services enabled that could be a security risk.

Hardware Information:

    iMac (21.5-inch, Late 2013)

    iMac Model: iMac14,1

    1 2,7 GHz Intel Core i5 (i5-4570R) CPU: 4-core

    16 GB RAM - Upgradeable by an Apple Authorized Service Provider

        BANK 0/DIMM0 - 8 GB DDR3 1600 

        BANK 1/DIMM0 - 8 GB DDR3 1600 

Video Information:

    Intel Iris Pro - VRAM: 1536 MB

        iMac 1920 x 1080