{"id":4605,"date":"2026-03-29T13:17:42","date_gmt":"2026-03-29T11:17:42","guid":{"rendered":"https:\/\/reparationmac.be\/?p=4605"},"modified":"2026-04-01T11:16:01","modified_gmt":"2026-04-01T09:16:01","slug":"slow-mac-solutions-optimization","status":"publish","type":"post","link":"https:\/\/reparationmac.be\/en\/mac-lent-solutions-optimisation\/","title":{"rendered":"Slow Mac: 12 tips to boost performance"},"content":{"rendered":"
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Slow Mac: 12 quick solutions to restore performance<\/h1>\n\n
\n Reading: 11 min<\/span>\n Troubleshooting<\/span>\n<\/div>\n\n\"Slow\n\n
\n In a nutshell:<\/strong> A slow Mac is caused in 70 % of cases by a saturated storage disk, insufficient RAM memory or a cluttered macOS system. The three most effective solutions are to replace the hard disk with an SSD (speed multiplied by 5 to 10), disable programs at start-up and clean up temporary files. Most slowdowns can be corrected without changing machines.\n<\/div>\n\n
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Contents<\/p>\n

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  1. Why has your Mac become slow?<\/a><\/li>\n
  2. Rapid diagnosis in 2 minutes<\/a><\/li>\n
  3. 6 software solutions (free)<\/a><\/li>\n
  4. 4 hardware solutions (upgrade)<\/a><\/li>\n
  5. 2 system solutions (macOS)<\/a><\/li>\n
  6. How much does fitness cost?<\/a><\/li>\n
  7. Frequently asked questions<\/a><\/li>\n <\/ol>\n<\/div>\n\n\n

    Why has your Mac become slow?<\/h2>\n\n

    A slow Mac is not necessarily a Mac at the end of its life. In the vast majority of cases, slowdowns can be explained by causes that can be identified and corrected. Here's what we see most often in the workshop when a customer brings us a Mac. Slow Mac<\/strong>.<\/p>\n\n\n \n \n \n \n \n \n \n \n \n
    Cause of slowdown<\/th>\n Frequency<\/th>\n Impact<\/th>\n <\/tr>\n <\/thead>\n
    \n Saturated or ageing mechanical hard disk drive (HDD)<\/span>\n iMac, MacBook Pro pre-2013, Mac mini<\/span>\n <\/td>\n ~35 %<\/td>\n Very high<\/td>\n <\/tr>\n
    \n SSD storage full (less than 10 % free)<\/span>\n All models, especially 128GB and 256GB<\/span>\n <\/td>\n ~25 %<\/td>\n High<\/td>\n <\/tr>\n
    \n Insufficient RAM for the applications used<\/span>\n 4 GB saturated by Chrome, Photoshop, Zoom<\/span>\n <\/td>\n ~20 %<\/td>\n High<\/td>\n <\/tr>\n
    \n macOS or obsolete applications<\/span>\n Compatibility, bugs, performance flaws<\/span>\n <\/td>\n ~10 %<\/td>\n Moderate<\/td>\n <\/tr>\n
    \n Overheating (dry thermal paste, dirty fan)<\/span>\n MacBook Pro 2012-2017, iMac 2009-2015<\/span>\n <\/td>\n ~5 %<\/td>\n Variable<\/td>\n <\/tr>\n
    \n Malware or adware<\/span>\n Browser extensions, pop-ups, redirects<\/span>\n <\/td>\n ~5 %<\/td>\n Moderate<\/td>\n <\/tr>\n <\/tbody>\n<\/table>\n\n

    A point often overlooked: macOS needs at least 15 to 20 % of free space<\/strong> on the disk to function correctly. Below this threshold, the system makes massive use of the swap file and everything becomes painfully slow. This is the first thing to check when a slow Mac makes you lose patience.<\/p>\n\n\n

    Rapid diagnosis: identify the cause in 2 minutes<\/h2>\n\n

    Before touching anything, open two macOS built-in tools to find out what's causing the problem on your computer Slow Mac<\/strong> :<\/p>\n\n

    Stage 1: Activity monitor<\/h3>\n

    Open Applications \u2192 Utilities \u2192 Activity monitor<\/strong>. Click on the CPU<\/em> and sort downwards by \u00ab% CPU\u00bb. If a process regularly exceeds 100 %, it's the culprit. The usual suspects: kernel_task<\/em> (overheating), WindowServer<\/em> (display), mds_stores<\/em> (Spotlight in indexing), or a browser with too many tabs.<\/p>\n\n

    Then go to the Memory<\/em>. At the bottom, look at the memory pressure bar :<\/p>\n