Authors 
Elena Petrova
Data Science
Elena writes data studies and benchmarks, and about the quality of collected data: how to measure it, clean it and build datasets that hold up.
Writes about
- Data studies and benchmarks
- Data quality
- Dataset building
Articles by Elena Petrova
-
October 11, 2026 · Knowledge
Do CAPTCHAs Stop Bots or Just Slow Them Down? Measuring Deterrence Against Solve Rate
What two decades of research says about CAPTCHAs: how long they cost humans, how often bots and AI agents solve them, and why they now work as a cost.
-
October 8, 2026 · Scraping
Payload Efficiency: What Share of a Scraped Page Is Boilerplate You Paid For
We measured 278 content pages from the top 1,000 sites. The text you want is about 1% of the HTML and a tiny share of what a browser downloads.
-
October 7, 2026 · Residential Proxies
Shifter Now Has the Largest Live US Residential IP Pool
We re-ran Shifter through our residential proxy benchmark: 212,212 live US IPs in 250,000 requests, the largest live US pool of the 16 networks we have measured.