Faster downloading grib files

src/main/scala/data/DataService.scala

@@ -78,7 +78,7 @@ class DataService(log: Logger[IO]) {
   private val semaphore = Semaphore[IO](4).unsafeRunSync()
 
   private val blockingEC = ExecutionContext.fromExecutorService(
-    Executors.newFixedThreadPool(4) // limit concurrency
+    Executors.newFixedThreadPool(8) // limit concurrency
   )
 
   def getBinaryChunk(offset: Int, length: Int, fileName: String): IO[Array[Byte]] = {

web/src/helpers/progressivePromises.ts

@@ -21,7 +21,7 @@ async function processPromises<T>(
 export async function processPromisesInBatches<T>(
     promiseFns: (() => Promise<T>)[],
     onProgress: (result: T) => void,
-    batchSize = 3,
+    batchSize = 10,
 ): Promise<(T | undefined)[]> {
     const results = []
     while(await promiseFns.length > 0) {