Performance

September 2026

• Sep 28, 2026ConceptsLeading vs Lagging Indicators ExplainedA leading indicator is a bet: it encodes your theory about what drives the outcome, which is why it has to be both predictive and something you can actually influence. This guide contrasts the two kinds of measurement across timing, actionability and certainty, then covers the three ways leading indicators fail: they get gamed when the number becomes the target, the assumed link to the outcome quietly breaks, and too many of them dilute focus.7 MIN1.1k

March 2026

• Mar 6, 2026ConceptsDecision Frameworks Used by High Performers to Think ClearlyPaul Meehl's 1954 review compared intuitive clinical judgment against rule-based prediction across 20 studies. Actuarial methods matched or beat the experts in 17 of them, and Grove and colleagues' 2000 meta-analysis of 136 studies found clinical judgment won in only 6 percent. This walks through eight frameworks: reversibility, regret minimization, 10/10/10, pre-mortem, decision journals, expected value, inversion and calibrated probability.25 MIN58.2k

February 2026

• Feb 6, 2026ConceptsVanity Metrics vs Meaningful MetricsEric Ries defined vanity metrics as numbers that feel good without helping you understand your situation. A startup reporting 100,000 downloads avoids saying 90% never opened the app and 200 people pay. The actionability test is one question: if this metric moves, what do you do differently? Page views up 30% gives no answer; conversion rate down 15% sends you into the funnel. Why they survive, and why context decides.18 MIN20.9k

January 2026

• Jan 6, 2026TechnologyGrowth Strategies for Scaling No-Code SystemsAirtable runs comfortably to roughly 25,000 to 50,000 records per table, and above that filtering, formulas and automation runs noticeably slow. Its API allows 5 requests per second per base, Notion starts dragging past 10,000 to 15,000 records, and Zapier bills per action step, so an eight-step Zap running 300 times a day burns 72,000 tasks a month. Archival patterns, batching and queueing buy you time; here is when to move to Postgres.17 MIN2.4k

December 2025

• Dec 30, 2025TechnologyScaling Cloud Systems: Strategies and PatternsMapping many logical shards onto few physical ones means adding hardware never requires reorganizing the shard layout, which is why the 2012 design became a reference implementation. The page is blunt that adding servers to a poorly designed system just produces a poorly designed system with more servers, and covers load balancing, statelessness, cache invalidation, read replicas and replication lag, queues, and the CAP tradeoff during a partition.26 MIN64.7k
• Dec 15, 2025TechnologyMobile Performance Optimization: Increasing App SpeedGoogle and DoubleClick research cited here found that 53% of mobile visitors abandon a session once load time passes 3 seconds, and the penalty curve is not linear: Google's 2017 analysis of 11 million mobile ad landing pages measured a 90% higher bounce rate at 3 to 5 seconds and 106% at 5 to 6 seconds. The article works through launch-time budgets, main-thread jank inside the 16.67ms frame window, list virtualization, memory limits, and battery.29 MIN47.8k

July 2025

• Jul 18, 2025ExplainersMetrics and Measurement: Importance in PerformanceWorkers allowed to develop local practices away from supervisory view outperformed those under continuous watch, because observation suppressed the experimentation that produced the best results. Landsberger's reanalysis of the original Hawthorne data points the same way: productivity rose from positive feedback and human attention, not from being monitored. The mechanism is social. This page covers leading versus lagging indicators, vanity metrics and gaming.31 MIN60.3k

June 2025

• Jun 16, 2025ExplainersStep-by-Step: Designing Effective MetricsMetrics shape behavior whether or not they measure the right thing, so gaming follows wherever stakes are attached. A Department of Justice investigation found Baltimore officers downgrading shootings and pressuring victims to withdraw reports under CompStat. Payment can also crowd out motive: Swiss communities offered compensation for a nuclear waste site accepted it at 25%, down from 51% with no money offered.36 MIN38.4k
• Jun 12, 2025ExplainersHow Database Indexes Improve Query PerformanceLeis and colleagues evaluated PostgreSQL alongside commercial systems and found estimation errors drove the planner to pick query plans 10 to 100 times slower than optimal, so a correct index can still go unused. The structural case for indexes remains overwhelming: with a branching factor of 500, a B-tree reaches 62.5 billion rows in four levels. This page covers clustered versus non-clustered, covering indexes, BRIN, the write penalty and reading EXPLAIN output.51 MIN10.4k

February 2025

• Feb 9, 2025ConceptsSocial Facilitation: When Others Make Us Better, or WorseBond and Titus pooled 241 studies and over 20,000 participants in 1983 and found the effect real but modest, a mean of about d = 0.22, driven mainly by task complexity, with little consistent evidence that physiological arousal is the mediating link. That leaves the phenomenon settled and the mechanism disputed: Zajonc's drive theory, Cottrell's evaluation apprehension, Baron's distraction-conflict account, and Bond's self-presentation view each explain part of it.19 MIN9.8k
• Feb 5, 2025ConceptsGoal-Setting Theory: Effective Strategies for SuccessWhat makes a goal change behavior. Latham and Baldes gave timber truck drivers one specific target, load to 94 percent of the legal maximum, with no bonus and no training on technique; load weights climbed toward it within weeks and stayed, while a control group given no number showed no change. Locke and Latham's 1990 book synthesized roughly 400 studies conducted over about 25 years.22 MIN6.2k

January 2025

• Jan 30, 2025ConceptsStereotype Threat: When Fear of Confirming Becomes RealGeoffrey Cohen and colleagues, writing in Science, had middle school students spend roughly fifteen minutes writing about values that mattered to them, repeated across a school year. In the 2006 study that exercise cut the racial achievement gap by about forty percent, with the largest effect among the most threat-sensitive students. Later replications, including a pre-registered null result in over 931 students, suggest a smaller and more conditional effect.18 MIN10.1k

February 2023

• Feb 26, 2023TechnologyThe Placebo-Nocebo Effect on Digital Product PerceptionUsers who lived through the slow period returned less often even after performance was restored. Google saw the same mechanism in 2008, when showing 30 results instead of 10 made users less satisfied because of a half-second of added load time. Perception is malleable in the other direction too: one study found satisfaction with identical load times varied by up to 40 percent depending on how good the loading screen looked.22 MIN13.1k

September 2022

• Sep 3, 2022ConceptsThe Impact of Sleep on Learning and MemoryWagner's Nature study suggests sleep restructures what you learned rather than just storing it. The process can even be steered, since Diekelmann and Born cued specific memories with odor cues during slow-wave sleep and consolidated those more strongly than uncued ones. The cost of skimping is quantified too: Williamson and Feyer put 17 to 18 hours awake at roughly the impairment of 0.05 percent blood alcohol.18 MIN3.6k