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In terms of raw power in a professional package, the ThinkPad W540 looks like the best bet, because it is so configurable, and has good battery life. But if you sacrifice some processor performance, the ThinkPad T440 offers a lighter and more portable package with even better battery life. The Asus N550JV could be tempting because, on paper, its i7-4700HQ offers significantly better performance than the T440’s i7-4600U, without scaling the heights of the i7-4930MX. The N550JV’s drawbacks are that it is just as heavy as your current ThinkPad L530, and will have similar or worse battery life.Ultimately, it comes down to performance per watt. The 35W and 47W versions of the Core i7 are always going to outperform the 15W versions, but the 15W Ultrabook chips are fine for most of the tasks people do on laptops. Run Windows 7’s Performance Monitor to find out what’s limiting your current system. For example, you could graph processor queue lengths, hard page faults and the current disk queue length. I don’t think the processor will be the biggest bottleneck.In general, I’d expect the biggest gains in all-round performance to come from having an SSD and more memory rather than a (literally) hotter processor.

And memory is cheap, so that’s the way to go.hich teenager doesn’t lie on their bed for hours hunched over their laptop, tablet or phone? There’s even a word for it – iPosture – and there is increasing evidence that it is causing back and neck pain in young adults.According to the British Chiropractic Association (BCA), its latest survey shows that 40% of those aged 16 to 24 have had back or neck pain, although it didn’t give the actual number of people included in its study. The same survey found that nearly two-thirds of this age group spent up to six hours a day on their mobile phone.One in seven parents thought that their child’s pain was related to the use of mobile technology. This is borne out by other studies and surveys which show that prolonged poor posture can have consequences.A questionnaire-based study from Finland involving 436 schoolchildren found that daily computer use of two hours or more increased the risk of pain in the neck and shoulders (21% of the children), pain in the head (20%) and pain in the lower back (16%). Girls were affected more than boys.When your child hunches over, they keep their head high and flex their neck, holding that position for some time. This increases pressure on the joints, causing pain in both the neck and shoulders. So much of childhood and teenage life is bound up with mobile technology that it is hard to imagine wrestling these devices away from them.

Encourage your children to move and change their posture. Ideally, they should get up and even walk around occasionally. Studies show that the most static children get the most back pain.The BCA advises putting laptops at a level where a child can sit with their arms resting on the desk when using the keyboard at elbow level. The top of the screen should be level with the eyebrows and the chair tilted slightly forward, so that the knees are lower than the hips. Feet should be flat on the ground.There is some concern that supporting the forearms may protect the neck and shoulders but increase wrist pain. The most important advice is probably that using a laptop or tablet on your lap isn’t good for anyone, and tablets should also be used on tables, preferably with keyboards if typing a lot.Children are likely to use mobile devices more rather than less. So encouraging them to fidget in this context is probably the best protection – as well as occasionally switching off the internet.I’m a novelist with a bad back, and need something more portable than my perfectly functional laptop for working on my manuscripts away from home. Netbooks are dead; Ultrabooks are expensive; Chromebooks defeat the object, because all I need is to work in, and save frequently on, Microsoft Word – no touchscreens and, probably, no cloud.

You don’t mention a budget, but is £350 too much? At the moment I’d go for an Asus VivoBook S200 with an 11.6in screen for £349.97. This gets you a PC that is about the size and weight of a netbook but with a much better specification. It includes an Intel Pentium processor, 4GB of memory, a 500GB hard drive, VGA (D-SUB) and HDMI video ports, two USB 2 ports, one USB 3 port, an SD card slot and an Ethernet port.The VivoBook S200SE comes loaded with Microsoft Windows 8, which will soon get a free upgrade to Windows 8.1. As you say, you don’t really need a touch-sensitive screen, but it is an advantage when using Windows 8’s modern (formerly Metro) apps downloaded from the Windows Store.Even better, go for VivoBook S200E, which is essentially the same machine with an Intel Core i3 processor. This increases the price by £37.90 to £387.87, but provides a worthwhile increase in performance. For completeness, you can also get the S200E with a much slower 1.1GHz Intel Celeron 847 processor and a smaller, 320GB hard drive for £329 from Tesco Direct. However, it’s really not worth saving £21.The VivoBook S200E is solidly made, for this class of machine, with a brushed aluminium top and a decent keyboard. It includes instant on, starting from sleep/hibernate in about two seconds. It doesn’t qualify as an Ultrabook because, at 21.7mm, it’s a couple of millimetres too thick.

If the 11.5in screen is too small, consider the Acer Aspire S3-391 Ultrabook at £451.99. This has a 13.3in non-touch screen, but otherwise it has a similar specification to the VivoBook S200E with an Intel Core i3-3217U. There’s also an Asus VivoBook S400CA with a 14in screen for £384, but this is about a pound heavier at 1.8kg against 1.3kg for the S200E and 1.4kg for the Acer Aspire S3-391.I looked at the Asus [VivoBook S200E] in John Lewis, who had only one left and think it’s being stopped. Can’t decide if I should snap it up or wait for possible future cheap models. I love the thought of one of these but will only be using it infrequently and am loathe to spend £350 on what feels like an indulgence. But is that a false economy? Also, today’s Guardian recommends a netbook: The purple Asus Eee PC X101CH weighs less than a kilo and has a 10.1in screen, a 1.6GHz Intel Atom processor and a 320GB hard drive. IT Trade Station sells it via Amazon for £219.95.Actually, there is a pink version of the same netbook being sold by Technoworld on Amazon for only £174, which is an even better deal.The Asus Eee PC X101CH is a very good netbook, as netbooks go, and it would do the job. However, netbooks have a lot of limitations, which is why they have almost died out (though they still sell in some poor countries, and are often used in schools).

The main limitations of the PC X101CH are its slow 32-bit 1.6GHz Intel Atom N2600 processor, slow graphics, very limited 1GB of memory, screen resolution of 1024 x 600 pixels, and its use of Microsoft Windows 7 Starter Edition. The Asus VivoBook S200E has a 64-bit processor that is two or three times quicker, has four times as much memory (4GB), a touch-sensitive screen, stereo sound and a significantly better keyboard. It also has, in Windows 8, a much better operating system. With most netbooks you would lose Windows 8’s fast start from sleep, though the PC X101CH does offer Asus’s own rapid-resume technology.The 1GB of memory is a big drawback when running Windows and Microsoft Office. Unfortunately, the memory is soldered to the motherboard and there is no standard SODIMM slot. This makes it impractical to replace the 1GB with the maximum 2GB memory chip that has been the salvation of many an old netbook.The netbook’s lower screen resolution means that you could lose roughly nine or 10 lines of text on screen, and each line will be about six words shorter, compared to the usual low-end Windows screen resolution of 1366 x 768 pixels. This is based on running Microsoft Word 2007 full screen with text in 11pt New Times Roman in web layout with the ribbon minimised, which I simulated by changing the size of Word’s window on my own much bigger (1920 x 1080) screen. That is, I could see 39 lines of text with Word in a 1366 x 768-pixel window and 29 lines in a 1024 x 600-pixel window. I usually write in a Word window that’s roughly 1200 x 800, so I find the netbook screen cramped. Tastes vary, so this may not bother you, but you should be aware of it.

Instead of a netbook, you should consider a new-style mini-laptop that doesn’t use an Intel processor, and is therefore free of Intel’s netbook requirements. The blue 11.6in Acer Aspire V5-121 is a good example at £237.94 with free delivery from Amazon.co.uk. For less than £20 more than a purple netbook, you get a 1kg laptop that has 2GB of memory, a standard 1366 x 768-pixel screen, and a full copy of Windows 8.The main drawback with the cheapest Acer Aspire V5-121 is the horribly slow 1GHz AMD C70 processor, which was previously used in some Acer Aspire One models sold as netbooks. However, NotebookCheck says the processor speed is somewhere between a single core 1.6 GHz Atom N455 and a dual core Atom N550, which puts it in the same ballpark as the Atom N2600. Without actually being able to try it, I’d guess that the extra memory (2GB) and the slightly better efficiency of Windows 8 will make the Aspire V5-121 roughly as good (or as bad) at running Microsoft Word.

Anyone who has done it is invited to comment below.The VivoBook S200E (£350) is a faster, better-made, and all-round much more capable Windows machine but, as you say, you already have a perfectly good laptop. If you’re only going to use it to run Microsoft Word, and run it infrequently, then it may not be worth paying twice the price of a pink Asus Eee PC X101CH (£174), or £112 more than an Acer Aspire V5-121 (£238). Your money, your decision.If you can wait, there should be some better mini-laptops coming out for the Christmas sales season. One example is the Dell Inspiron 11. Most will have Windows 8.1 and some will have new versions of Intel’s Core iX chips (code-named Haswell) and a much-improved Atom processor (Bay Trail), which will be better at running Microsoft Word.wo small boys are standing hunched outside the window of the Groupe Scholaire Kagugu school in Rwanda’s capital, Kigali, a cluster of low, shed-like buildings set around a central yard. A sudden tropical downpour is rattling the frame. Heavy droplets stick to the pane, distorting the faces pressed against the glass.The taller of the boys pulls a tan jacket over his head. But the drenching does not discourage them. Their eyes don’t shift. What they want to see, so desperately, is inside the classroom.It’s an object 10 inches square, green, white and rubberised, inscribed with the logo of an X and a filled-in O. There are rows of them: scaled-down laptops in front of every pupil, commanding the silent, rapt attention of the sitting children who have been given them from a cardboard box.

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