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deepgram-performance-tuning Optimize Deepgram API performance for faster transcription and lower latency.
Use when improving transcription speed, reducing latency,
or optimizing audio processing pipelines.
Trigger: "deepgram performance", "speed up deepgram", "optimize transcription",
"deepgram latency", "deepgram faster", "deepgram throughput".
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name deepgram-performance-tuning description Optimize Deepgram API performance for faster transcription and lower latency.
Use when improving transcription speed, reducing latency,
or optimizing audio processing pipelines.
Trigger: "deepgram performance", "speed up deepgram", "optimize transcription",
"deepgram latency", "deepgram faster", "deepgram throughput".
allowed-tools Read, Write, Edit, Bash(ffmpeg:*), Bash(ffprobe:*) version 1.0.0 license MIT author Jeremy Longshore <jeremy@intentsolutions.io> compatible-with claude-code, codex, openclaw tags ["saas","deepgram","api","performance","optimization"]
Deepgram Performance Tuning
Overview
Optimize Deepgram transcription performance through audio preprocessing with ffmpeg, model selection for speed vs accuracy, streaming for large files, parallel processing, result caching, and connection reuse. Targets: <2s latency for short files, 100+ files/minute batch throughput.
Performance Levers
Factor Impact Default Optimized Audio format High Any format 16kHz mono WAV Model High nova-3 base (speed) or nova-3 (accuracy) File size High Full file sync Stream >60s, callback >5min Concurrency Medium Sequential 50 parallel (p-limit) Caching Medium None Redis hash by audio+options Features Medium All enabled Disable unused (diarize, utterances)
Instructions
Step 1: Audio Preprocessing with ffmpeg
ffmpeg -i input.mp3 \
-ar 16000 \
-ac 1 \
-acodec pcm_s16le \
-f wav \
output.wav
ffmpeg -i input.wav \
-af "silenceremove=stop_periods=-1:stop_duration=0.5:stop_threshold=-30dB" \
-ar 16000 -ac 1 -acodec pcm_s16le \
trimmed.wav
ffmpeg -i input.wav \
-af "highpass=f=200,lowpass=f=3000,loudnorm=I=-16:TP=-1.5:LRA=11" \
-ar 16000 -ac 1 -acodec pcm_s16le \
clean.wav
import { execSync } from 'child_process' ;
import { statSync } from 'fs' ;
function preprocessAudio (inputPath : string , outputPath : string
originalSize
number
optimizedSize
number
savings
string
const
statSync
size
execSync
`ffmpeg -y -i "${inputPath} " \
-af "silenceremove=stop_periods=-1:stop_duration=0.5:stop_threshold=-30dB,\
highpass=f=200,lowpass=f=3000" \
-ar 16000 -ac 1 -acodec pcm_s16le \
"${outputPath} " 2>/dev/null`
const
statSync
size
const
1
100
toFixed
1
console
log
`Preprocessed: ${inputPath} `
console
log
` Original: ${(originalSize / 1024 ).toFixed(0 )} KB`
console
log
` Optimized: ${(optimizedSize / 1024 ).toFixed(0 )} KB (${savings} % smaller)`
return
Step 2: Model Selection Strategy import { createClient } from '@deepgram/sdk' ;
type Priority = 'accuracy' | 'speed' | 'cost' ;
function selectModel (priority : Priority , audioDuration : number string {
switch (priority) {
case 'accuracy' :
return 'nova-3' ;
case 'speed' :
return audioDuration > 300 ? 'base' : 'nova-2' ;
case 'cost' :
return 'nova-2' ;
default :
return 'nova-3' ;
}
}
function optimizedOptions (priority : Priority return {
model : selectModel (priority, 0 ),
smart_format : true ,
punctuate : true ,
diarize : priority === 'accuracy' ,
utterances : priority === 'accuracy' ,
paragraphs : priority === 'accuracy' ,
summarize : false ,
detect_topics : false ,
sentiment : false ,
};
}
Step 3: Streaming for Large Files import { createClient, LiveTranscriptionEvents } from '@deepgram/sdk' ;
import { createReadStream } from 'fs' ;
async function streamLargeFile (filePath : string Promise <string > {
const deepgram = createClient (process.env .DEEPGRAM_API_KEY !);
const transcripts : string [] = [];
return new Promise ((resolve, reject ) => {
const connection = deepgram.listen .live ({
model : 'nova-3' ,
smart_format : true ,
encoding : 'linear16' ,
sample_rate : 16000 ,
channels : 1 ,
});
connection.on (LiveTranscriptionEvents .Open , () => {
const stream = createReadStream (filePath, { highWaterMark : 32 * 1024 });
stream.on ('data' , (chunk : Buffer {
connection.send (chunk);
});
stream.on ('end' , () => {
connection.finish ();
});
stream.on ('error' , reject);
});
connection.on (LiveTranscriptionEvents .Transcript , (data ) => {
if (data.is_final ) {
const text = data.channel .alternatives [0 ]?.transcript ;
if (text) transcripts.push (text);
}
});
connection.on (LiveTranscriptionEvents .Close , () => {
resolve (transcripts.join (' ' ));
});
connection.on (LiveTranscriptionEvents .Error , reject);
});
}
Step 4: Parallel Batch Processing import pLimit from 'p-limit' ;
import { createClient } from '@deepgram/sdk' ;
async function batchTranscribe (
files : string [],
concurrency = 50 ,
model = 'nova-3'
) {
const client = createClient (process.env .DEEPGRAM_API_KEY !);
const limit = pLimit (concurrency);
const startTime = Date .now ();
const results = await Promise .allSettled (
files.map ((file, i ) =>
limit (async () => {
const fileStart = Date .now ();
const { result, error } = await client.listen .prerecorded .transcribeFile (
require ('fs' ).readFileSync (file),
{ model, smart_format : true , mimetype : 'audio/wav' }
);
if (error) throw error;
const elapsed = Date .now () - fileStart;
console .log (`[${i + 1 } /${files.length} ] ${file} — ${elapsed} ms (${result.metadata.duration} s audio)` );
return { file, result, elapsed };
})
)
);
const totalTime = Date .now () - startTime;
const succeeded = results.filter (r =>status === 'fulfilled' ).length ;
console .log (`\nBatch: ${succeeded} /${files.length} in ${totalTime} ms` );
console .log (`Throughput: ${(files.length / (totalTime / 60000 )).toFixed(1 )} files/min` );
return results;
}
Step 5: Result Caching import { createHash } from 'crypto' ;
import Redis from 'ioredis' ;
const redis = new Redis (process.env .REDIS_URL ?? 'redis://localhost:6379' );
function cacheKey (audioUrl : string , options : Record <string , any >string {
const hash = createHash ('sha256' )
.update (audioUrl + JSON .stringify (options))
.digest ('hex' );
return `dg:cache:${hash} ` ;
}
async function cachedTranscribe (
client : ReturnType <typeof createClient>,
url : string ,
options : Record <string , any >,
ttlSeconds = 3600
) {
const key = cacheKey (url, options);
const cached = await redis.get (key);
if (cached) {
console .log ('Cache hit:' , url.substring (0 , 60 ));
return JSON .parse (cached);
}
const { result, error } = await client.listen .prerecorded .transcribeUrl (
{ url }, options
);
if (error) throw error;
await redis.setex (key, ttlSeconds, JSON .stringify (result));
console .log ('Cached result:' , url.substring (0 , 60 ));
return result;
}
Step 6: Performance Benchmarking async function benchmark (audioUrl : string const client = createClient (process.env .DEEPGRAM_API_KEY !);
const models = ['nova-3' , 'nova-2' , 'base' ] as const ;
console .log ('Performance Benchmark' );
console .log ('=' .repeat (60 ));
for (const model of models) {
const times : number [] = [];
for (let i = 0 ; i < 3 ; i++) {
const start = Date .now ();
const { result, error } = await client.listen .prerecorded .transcribeUrl (
{ url : audioUrl }, { model, smart_format : true }
);
times.push (Date .now () - start);
if (error) { console .error (`${model} error:` , error.message ); break ; }
}
const avg = times.reduce ((a, b ) => a + b, 0 ) / times.length ;
console .log (`${model} : avg ${avg.toFixed(0 )} ms (${times.map(t => `${t} ms` ).join(', ' )} )` );
}
}
Output
Audio preprocessing pipeline (16kHz mono, silence removal, noise reduction)
Model selection strategy by priority (accuracy/speed/cost)
Streaming transcription for large files (>60s)
Parallel batch processing with configurable concurrency
Redis-backed result caching with TTL
Performance benchmarking script
Error Handling Issue Cause Solution Slow transcription Unoptimized audio format Preprocess to 16kHz mono WAV 429 in batch Concurrency too high Reduce p-limit to 50% of plan limit ffmpeg not found Not installed apt install ffmpeg / brew install ffmpegCache stale Audio changed at same URL Include hash of audio content in cache key
Resources 