Welcome to the Q&A Forum

Well... i have two news for you. First - good one... theme is good looks fantastic.

Now bad news - i look it on mobile phone and you can see result in attached file. Yes - i have iPhone SE because i love it's form-factor.

I'm so sorry but it's year of 2018 and everyone today works with smartphone. Probably something custom should works perfect for you. Because it's 2018 and there is also AMP that you should check that too:
https://moz.com/blog/amp-digital-marketing-2018

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Right now we're updating SEOSpyder ( http://www.mobiliodevelopment.com/seospyder/ ) for rendering pages but i can't give you timeframe when will be done.

So far memory requirements isn't too high and was crawl 250k site with 8G ram machine.

Just as EGOL describe it.

If you're on Amazon AWS then you can use their CloudFront as CDN. But also you can observe source of traffic. Could coming from one country, one IP range or one user-agent. There should be some kind of pattern and you should investigate it.

Then just need to make rule to block that traffic or just redirect them to one static "hello world" page.

I was also victim of such traffic, but was from humans trying to depleting an AdWords daily budget. Once budget it over ads was stopped showing, after few hours they recalculate clicks, some funds was returned, ads are shown again, they click it, budget is over... and so on.

Is code on .htaccess works?

It should be on top because that file is executed from top to bottom. And if some rule must be executed then execution flow can stop so next rows can't be executed.

I think that i was answer you on other forum...

Best practices is to remove and noindex such parameters. One of latest projects was Ecommerce shop with 5k products and over 220k indexed pages from categories.

So you need to AVOID indexing such ?results=16 or ?order=asc or ?search=test and to have PURE and only pagination.

Example:
https://www.jamestowndistributors.com/product/epoxy-and-adhesives
https://www.jamestowndistributors.com/product/epoxy-and-adhesives?page=2
https://www.jamestowndistributors.com/product/epoxy-and-adhesives?page=3
https://www.jamestowndistributors.com/product/epoxy-and-adhesives?page=4
are ONLY valid categories pages.

If you have infinite scroll situation is described here:
https://developers.google.com/search/blog/2014/02/infinite-scroll-search-friendly?hl=en

I hope that this will help you!

Peter