diff --git a/cmd/lotus-worker/main.go b/cmd/lotus-worker/main.go
index bb7fa94d8..42f46c9d8 100644
--- a/cmd/lotus-worker/main.go
+++ b/cmd/lotus-worker/main.go
@@ -257,7 +257,7 @@ var runCmd = &cli.Command{
 		&cli.IntFlag{
 			Name:    "post-parallel-reads",
 			Usage:   "maximum number of parallel challenge reads (0 = no limit)",
-			Value:   128,
+			Value:   32,
 			EnvVars: []string{"LOTUS_WORKER_POST_PARALLEL_READS"},
 		},
 		&cli.DurationFlag{
diff --git a/documentation/en/cli-lotus-worker.md b/documentation/en/cli-lotus-worker.md
index 992601719..2000b1978 100644
--- a/documentation/en/cli-lotus-worker.md
+++ b/documentation/en/cli-lotus-worker.md
@@ -47,7 +47,7 @@ OPTIONS:
    --no-local-storage            don't use storageminer repo for sector storage (default: false) [$LOTUS_WORKER_NO_LOCAL_STORAGE]
    --no-swap                     don't use swap (default: false) [$LOTUS_WORKER_NO_SWAP]
    --parallel-fetch-limit value  maximum fetch operations to run in parallel (default: 5) [$LOTUS_WORKER_PARALLEL_FETCH_LIMIT]
-   --post-parallel-reads value   maximum number of parallel challenge reads (0 = no limit) (default: 128) [$LOTUS_WORKER_POST_PARALLEL_READS]
+   --post-parallel-reads value   maximum number of parallel challenge reads (0 = no limit) (default: 32) [$LOTUS_WORKER_POST_PARALLEL_READS]
    --post-read-timeout value     time limit for reading PoSt challenges (0 = no limit) (default: 0s) [$LOTUS_WORKER_POST_READ_TIMEOUT]
    --precommit1                  enable precommit1 (default: true) [$LOTUS_WORKER_PRECOMMIT1]
    --precommit2                  enable precommit2 (default: true) [$LOTUS_WORKER_PRECOMMIT2]
diff --git a/documentation/en/default-lotus-miner-config.toml b/documentation/en/default-lotus-miner-config.toml
index 416531f98..584def608 100644
--- a/documentation/en/default-lotus-miner-config.toml
+++ b/documentation/en/default-lotus-miner-config.toml
@@ -352,7 +352,7 @@
   #
   # type: int
   # env var: LOTUS_PROVING_PARALLELCHECKLIMIT
-  #ParallelCheckLimit = 128
+  #ParallelCheckLimit = 32
 
   # Maximum amount of time a proving pre-check can take for a sector. If the check times out the sector will be skipped
   # 
diff --git a/node/config/def.go b/node/config/def.go
index 9a24449ba..f50e9575a 100644
--- a/node/config/def.go
+++ b/node/config/def.go
@@ -154,7 +154,7 @@ func DefaultStorageMiner() *StorageMiner {
 		},
 
 		Proving: ProvingConfig{
-			ParallelCheckLimit:    128,
+			ParallelCheckLimit:    32,
 			PartitionCheckTimeout: Duration(20 * time.Minute),
 			SingleCheckTimeout:    Duration(10 * time.Minute),
 		},