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Peter, my friend! Here's some advice. Buy a graphics card.
And in the meantime, download TuneUp Utilities.
Use it to optimize the entire system. I highly recommend it. It's a great program.
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Yes, I'll add something else on the topic.
I'm making an XXXL map, and on this computer:
Intel 2 cores 3.0 GHz
1 GB of RAM
GeForce 6600 256 MB graphics card.
Now, towards the end, the PC is thinking for a long time... It's lagging. The game runs slowly, loading takes a long time, etc.
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I'm tired of it, in general. I moved the map to another computer.
4 cores, Intel 3.0 GHz
8 GB of RAM
Graphics card = 2 paired 9800 1 GB GTX
It's like night and day. In the editor, everything moves like a knife through butter.
There's no lag during the game.
Евангелие от Иоанна, 1.5: Lux in tenebris lucet, et tenebrae eam non comprehenderunt. Свет во тьме светит, и тьма не объяла его.