Page transfer budget
Groups match in order.
Web performance and application capacity ↗THE SUMFIZZ LIBRARY
Web performance and application capacity calculators
Explore 15 free tools for web performance and application capacity. Find page transfer budget, image lazy-loading savings, responsive image slot planner and more. Each calculator explains its inputs and method, with examples you can try using your own numbers.
THE SUMFIZZ LIBRARY
What are we working out?
Image lazy-loading savings
Initial image indices are unique.
Web performance and application capacity ↗Responsive image slot planner
For each slot, choose the smallest supplied source width at least as large as slot × pixel ratio.
Web performance and application capacity ↗Web font subset savings
Each uncached visit downloads every listed font weight.
Web performance and application capacity ↗Cache hit-rate cost model
Every request pays the cache lookup charge; only misses pay the origin charge.
Web performance and application capacity ↗CDN egress invoice comparison
Uses your supplied flat per-region rates and free allowances; unused regional allowances do not transfer.
Web performance and application capacity ↗Database connection pool capacity
A steady-state average model: one transaction holds one connection for the measured time.
Web performance and application capacity ↗Database index storage estimate
A user-supplied per-row model.
Web performance and application capacity ↗Database query fan-out
Every incoming request produces the same fan-out.
Web performance and application capacity ↗Batch API request packing
Packs consecutive records without reordering using the next-fit rule.
Web performance and application capacity ↗Retry amplification model
Assumes identical independent failures, immediate failure detection and retries only after failure.
Web performance and application capacity ↗Exponential backoff schedule
Retry i uses min(cap, initial × multiplier^(i−1)).
Web performance and application capacity ↗Event retention partition planner
Assumes constant event volume and packed size-based partitions across the whole retention window.
Web performance and application capacity ↗Database replication lag catch-up
Transfer and apply stages are treated as a continuously pipelined bottleneck.
Web performance and application capacity ↗Distributed clock drift budget
A conservative linear bound for one clock after an interval without resynchronization.
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