A slow API is more than a technical issue; it directly impacts user experience, conversions, and revenue. Mobile apps feel laggy, dashboards time out, integrations fail, and customers lose trust. Many teams don’t need a full rewrite; they need targeted performance fixes backed by real diagnostics. Our API Performance Fix Solutions focus on identifying the real bottlenecks and delivering measurable speed improvements for APIs built with Django REST Framework or FastAPI.
Common Symptoms of Slow APIs
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High response times during peak traffic
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Random timeouts and failed requests
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Mobile apps loading slowly or freezing
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Database CPU spikes and connection exhaustion
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APIs that degrade over time
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Performance issues after feature additions
Our API Performance Fix Approach
We follow a data-driven, CRO-focused optimization process.
Step 1: Performance Audit
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Endpoint-level latency analysis
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Database query profiling (N+1 detection)
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Payload size and serialization review
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Infrastructure and network inspection
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Caching and concurrency assessment
Step 2: Bottleneck Identification
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Slow database queries and missing indexes
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Blocking I/O or sync code in async paths
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Inefficient serializers and over-fetching
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Missing or misconfigured caching
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Poor timeout and connection settings
Step 3: Targeted Optimization
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Query optimization and indexing
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Serializer and payload slimming
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Async refactoring where needed
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Redis caching (response/object level)
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Background task offloading
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Connection pooling and tuning
Framework-Specific Fixes
Django REST Framework
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Queryset optimization and prefetching
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Serializer performance tuning
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Middleware and signal cleanup
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Caching with Redis or database
FastAPI
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Async endpoint refactoring
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Non-blocking I/O enforcement
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Pydantic model optimization
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Event loop and worker tuning
What We Deliver
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Clear performance audit report
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Before vs after benchmarks
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Optimized code and configuration
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Improved API response times
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Stability under load
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Documentation of changes
Key Results Clients See
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2x–10x faster API response times
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Reduced timeout and error rates
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Lower database and infrastructure load
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Better mobile and frontend performance
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Improved user satisfaction and retention
Why Choose PySquad
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Proven experience fixing real production APIs
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Deep understanding of Django REST and FastAPI internals
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Measurable performance improvements, not guesses
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Minimal disruption to live systems
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Clear communication and transparent reporting
Call to Action
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Request an API Performance Audit
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Get a Quick Win Optimization Plan
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Ask for Before/After Benchmark Examples
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Book a Technical Consultation