Every office has one: a desktop that takes four minutes to reach the desktop and a user who has stopped filing tickets because nothing ever changes. We closed 411 slow-PC tickets in 2025 and 2026. Here is what actually caused them, ranked by how often we hit it, along with the 10-minute check a user can run and the numbers behind the repair-or-replace call.
1. First split: is the computer slow, or is the network slow?
When a user reports "my PC is slow," the first thing we do on site is not open the case. It is to ask three questions: are local applications (Excel, the ERP client) slow, are web pages slow, and is everything slow or only certain programs? Three questions carve the fault domain cleanly:
- Local apps are slow too — the problem is the machine itself (disk, RAM, CPU, OS, malware). Continue to section 2.
- Only web and intranet systems are slow — the problem is most likely the network: switch, Wi-Fi, DNS, or the ISP. See our office network slowdown case study.
- Only certain programs are slow — an application-level issue such as cache bloat, database fragmentation or a version bug. Handle it case by case.
Two minutes of triage. Get the direction wrong and everything after it is wasted work.
2. The machine itself is slow: six causes, ranked by hit rate
Across the 411 slow-PC tickets we closed in 2025–2026, the causes distributed as follows. A single PC can show several of these at once.:
| Rank | Cause | Share | Signature | Fix cost |
|---|---|---|---|---|
| 1 | Still running Windows 10 or 11 on a mechanical hard drive | 46% | 3+ minute boot; Task Manager disk usage pinned at 100% | SSD swap, RMB 200–400 |
| 2 | Not enough RAM (4 or 8 GB for modern office work) | 28% | A dozen browser tabs plus Excel freezes the machine; window switching spins | Add RAM, RMB 150–350 |
| 3 | Bloatware bundles or crypto-mining malware | 22% | Fans screaming with nothing open; pop-ups; browser homepage hijacked | Cleanup, free to RMB 100 |
| 4 | System drive nearly full (under 15% free) | 18% | C: drive in red; updates fail; page file thrashing | Cleanup or migration, RMB 0–100 |
| 5 | Thermal throttling (mostly laptops) | 15% | Gets slower the longer it runs; hot underside; fans loud or suspiciously silent | Dust-out and repaste, RMB 80–150 |
| 6 | Dying drive: bad sectors or a failing SSD | 9% | Slowness with read/write error prompts; corrupted files; blue screens | Back up the data first, then replace, RMB 200–500 |
Note item 6: slowness is sometimes the death rattle of a drive rather than plain old age. The response is completely different. Ordinary slowness can wait for optimization; a drive with suspected bad sectors needs its data rescued first. How to tell: next section.
3. A 10-minute self-check, in order — stop when it gets better
- Task Manager, three gauges (Ctrl+Shift+Esc): which of CPU, Memory or Disk is in the red? Disk at 100% points to a mechanical drive or bad sectors. Memory at 90%+ means add RAM or kill background apps. CPU at 30%+ while idle means hunt rogue processes: right-click, Open file location, and end and uninstall anything you do not recognize.
- Check drive health. CrystalDiskInfo (free) reads S.M.A.R.T. status. "Good" rules out bad sectors, so move on. "Caution" or "Bad" means back up the data before any optimization, and see drive failure handling.
- Check startup items. Task Manager, Startup tab: disable everything except the input method and antivirus. The average enterprise PC we see carries 40+ startup entries, half of them assorted "assistants," "managers" and "updaters."
- Check system drive space. Windows visibly crawls below 15% free on C:. WeChat, QQ and DingTalk store chat files on C: by default, and three years of office WeChat alone can eat 50 GB. Move the storage path to D: in each app's settings.
- Check temperatures (laptops). A CPU above 75 °C at office load, or brushing 95 °C and throttling on light work, means dust-out and repaste. A laptop never cleaned in three years has heatsink fins matted like felt, and that is the norm, not the exception.
- Scan for malware. Run a full Windows Defender scan (free and adequate), then a dedicated bloatware remover. In 2026 the most common office-PC infections are not classic viruses but silently installed promotion bundles and mining trojans. The signature of the latter: the fans take off the moment the PC goes idle.
4. When replacing beats repairing: run the numbers
| Situation | Recommendation | Cost reference |
|---|---|---|
| Under 5 years old, i5/R5-class CPU, bottleneck is disk and RAM only | Upgrade: NVMe SSD plus RAM to 16 GB | RMB 350–700; feels close to new |
| 7+ years old, pre-4th-gen i3 / Pentium / Celeron | Replace. An old CPU falls below Windows 11's minimum CPU requirement, so upgrades treat symptoms, not the disease | Office desktop, RMB 2,200–3,200 |
| A fleet of 10+ machines all slow | Batch upgrade program: unit cost drops to RMB 300–400. We converted 32 eight-year-old machines to SSD at RMB 380 each, buying three more years of service. See the batch upgrade case study | Quoted per fleet |
One 2026 variable: AI server demand has pushed RAM and SSD prices up again.. An 8 GB DDR4 stick went from about RMB 100 to 200-plus, and the market is still elevated. Budget upgrades at current prices, not last year's articles.
5. The root fix for a fleet: stop the 411 tickets from recurring
Fixing one machine stops the bleeding. The ugliest number in our ticket stats: 31% of machines report "slow" again within a year, because the root causes never moved — overdue replacement, no maintenance regime, uncontrolled software installs. Three recommendations for whoever runs the fleet:
- Keep an asset register with a refresh cycle. Force a replacement assessment at 5–6 years; do not wait for staff complaints. Standardize the purchase baseline at i5, 16 GB and a 512 GB NVMe drive, and lifetime maintenance cost roughly halves.
- Take away local admin rights. Staff install software through an approval process, not by clicking anything that pops up. In every client account where we enforced this, bloatware tickets went to zero.
- Sign an annual contract that includes quarterly on-site rounds. Those visits cover dust-out, health checks, patches and backup verification kill faults before they become tickets. Panyu and Nansha businesses can see our IT outsourcing page; it is priced per machine, less than a coffee a month.
Single-PC on-site diagnosis covers Panyu and Nansha the same day at RMB 50, credited toward the repair; fleet and outsourcing proposals start with a free survey. Call 020-39029800 or +86-188-25126836.