The billion cookies per second was during a frenzy so the actual rate of cookies per second was that divided by 7. Currently I'm on 673.7 million CPS and I just clicked a lucky cookie which gave me 606 billion. That last part is so much because I currently have 28.3 trillion cookies in my bank. The more you have in your bank, the more the lucky cookie will give you and since these cookies make up for about 50% of the golden cookies, it pays to have something in the bank. After you leave it running all night, don't be tempted to immediately invest all of it into new stuff. Leave it in there for a while and click those golden cookies. You'll be surprised how much you'll be making with those compared to your regular rate.
You should also be aware that there are multiple upgrades per type of building. These only become available once you have more of that type of building. For example I think there is a threshold at 25 pieces and at 50 pieces and at 100 pieces and possibly 150 pieces. Each of those upgrades doubles the effectiveness of that particular type of building.
I had to seriously zoom out my browser in order to get all the buildings to show up on the screenshot.
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As you can see, I have 150 cursors and grannies. These may seem like unimportant buildings, but they have various links to other things. You will find out for yourself once you've invested in more of them. It seems counterintuitive to do so, but I assure you you won't regret it once you have all the upgrades they bring. Don't go all the way to 150 right away though, this is something which you have to build up gradually along with the more potent buildings. But try to get your Cursors and Grandmas to 50 each first and see what that brings for you. Grandmas can also boost productivity of all other types of buildings. Once you've purchased about 15 of any type, a new upgrade for the grannies will become available that boosts that type of building's productivity. Or at least I think it does. In any case, there are benefits to be had there. Same is true for the cursors which may tie in with the golden cookies.
Regarding the golden cookies, you're gonna wanna try to get those couple of upgrades to which I pointed arrows in a previous screenshot. The ones which look like four leave clovers. The first two of those will make golden cookies appear twice as often. The third one (which I'm currently hunting for) will make the golden cookie effects last twice as long. This of course has no influence on the lucky cookies, since those are based on the amount of cookies you have in the bank, but it makes a huge difference for all types of frenzies. Most importantly, I know from the past that it is possible to have multiple golden cookie effects combine. For example, you click a golden cookie and you get a regular frenzy (CPS * 7). This lasts for 77 seconds normally, but with the last clover it would last 154 seconds. By the time that frenzy is up there may already be a new golden cookie for you to click. The effect of that cookie will then be multiplied by 7 as well. So in my case a lucky cookie would then perhaps not be 606 billion but 7 times 606 billion. And if you get a regular frenzy combined with a click frenzy, then the cookies will be flying around your ears with every click. I can only imagine what the result would be if you get a frenzy combined with a cookie storm! COOOOOOKIEEEEEEEES! (they didn't have cookie storm when I played back in the day so I think that's a nifty new touch)
