As far as I am aware it won't affect your ads. All it means is that your site will be protected against DDOS & DOS attacks. Cloudflare will keep your site online by showing a cached version instead of a live version if you are under attack.
I think the reason it 'speeds' up your site is due to caching as well.
I use Cloudflare but only to keep my site online if my server goes down. I didn't notice any difference in speed.
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