diff --git a/chronos/apps/http/httpserver.nim b/chronos/apps/http/httpserver.nim
index 92ed3567..c1e52793 100644
--- a/chronos/apps/http/httpserver.nim
+++ b/chronos/apps/http/httpserver.nim
@@ -11,7 +11,7 @@
 
 import std/[tables, uri, strutils]
 import stew/[base10], httputils, results
-import ../../[asyncloop, asyncsync]
+import ../../[asyncloop, asyncsync, config]
 import ../../streams/[asyncstream, boundstream, chunkstream]
 import "."/[httptable, httpcommon, multipart]
 from ../../transports/common import TransportAddress, ServerFlags, `$`, `==`
@@ -244,7 +244,7 @@ proc new*(
        serverUri = Uri(),
        serverIdent = "",
        maxConnections: int = -1,
-       bufferSize: int = 4096,
+       bufferSize: int = chronosTransportDefaultBufferSize,
        backlogSize: int = DefaultBacklogSize,
        httpHeadersTimeout = 10.seconds,
        maxHeadersSize: int = 8192,
@@ -304,7 +304,7 @@ proc new*(
        serverUri = Uri(),
        serverIdent = "",
        maxConnections: int = -1,
-       bufferSize: int = 4096,
+       bufferSize: int = chronosTransportDefaultBufferSize,
        backlogSize: int = DefaultBacklogSize,
        httpHeadersTimeout = 10.seconds,
        maxHeadersSize: int = 8192,
diff --git a/chronos/apps/http/multipart.nim b/chronos/apps/http/multipart.nim
index 302d6efd..5c50e461 100644
--- a/chronos/apps/http/multipart.nim
+++ b/chronos/apps/http/multipart.nim
@@ -20,6 +20,7 @@ export asyncloop, httptable, httpcommon, httpbodyrw, asyncstream, httputils
 const
   UnableToReadMultipartBody = "Unable to read multipart message body, reason: "
   UnableToSendMultipartMessage = "Unable to send multipart message, reason: "
+  MaxMultipartHeaderSize = 4096
 
 type
   MultiPartSource* {.pure.} = enum
@@ -142,10 +143,11 @@ proc init*[A: BChar, B: BChar](mpt: typedesc[MultiPartReader],
   MultiPartReader(kind: MultiPartSource.Buffer,
                   buffer: buf, offset: 0, boundary: fboundary)
 
-proc new*[B: BChar](mpt: typedesc[MultiPartReaderRef],
-                    stream: HttpBodyReader,
-                    boundary: openArray[B],
-                    partHeadersMaxSize = 4096): MultiPartReaderRef =
+proc new*[B: BChar](
+    mpt: typedesc[MultiPartReaderRef],
+    stream: HttpBodyReader,
+    boundary: openArray[B],
+    partHeadersMaxSize = MaxMultipartHeaderSize): MultiPartReaderRef =
   ## Create new MultiPartReader instance with `stream` interface.
   ##
   ## ``stream`` is stream used to read data.
diff --git a/chronos/apps/http/shttpserver.nim b/chronos/apps/http/shttpserver.nim
index 6272bb2b..532839d2 100644
--- a/chronos/apps/http/shttpserver.nim
+++ b/chronos/apps/http/shttpserver.nim
@@ -10,7 +10,7 @@
 {.push raises: [].}
 
 import httpserver
-import ../../asyncloop, ../../asyncsync
+import ../../[asyncloop, asyncsync, config]
 import ../../streams/[asyncstream, tlsstream]
 export asyncloop, asyncsync, httpserver, asyncstream, tlsstream
 
@@ -91,7 +91,7 @@ proc new*(htype: typedesc[SecureHttpServerRef],
           serverIdent = "",
           secureFlags: set[TLSFlags] = {},
           maxConnections: int = -1,
-          bufferSize: int = 4096,
+          bufferSize: int = chronosTransportDefaultBufferSize,
           backlogSize: int = DefaultBacklogSize,
           httpHeadersTimeout = 10.seconds,
           maxHeadersSize: int = 8192,
@@ -157,7 +157,7 @@ proc new*(htype: typedesc[SecureHttpServerRef],
           serverIdent = "",
           secureFlags: set[TLSFlags] = {},
           maxConnections: int = -1,
-          bufferSize: int = 4096,
+          bufferSize: int = chronosTransportDefaultBufferSize,
           backlogSize: int = DefaultBacklogSize,
           httpHeadersTimeout = 10.seconds,
           maxHeadersSize: int = 8192,
diff --git a/chronos/config.nim b/chronos/config.nim
index cf500dba..26d110f1 100644
--- a/chronos/config.nim
+++ b/chronos/config.nim
@@ -97,6 +97,9 @@ const
   chronosStreamDefaultBufferSize* {.intdefine.} = 16384
     ## Default size of chronos async stream internal buffer.
 
+  chronosTLSSessionCacheBufferSize* {.intdefine.} = 4096
+    ## Default size of chronos TLS Session cache's internal buffer.
+
 when defined(chronosStrictException):
   {.warning: "-d:chronosStrictException has been deprecated in favor of handleException".}
   # In chronos v3, this setting was used as the opposite of
@@ -123,6 +126,8 @@ when defined(debug) or defined(chronosConfig):
       chronosTransportDefaultBufferSize)
     printOption("chronosStreamDefaultBufferSize",
       chronosStreamDefaultBufferSize)
+    printOption("chronosTLSSessionCacheBufferSize",
+      chronosTLSSessionCacheBufferSize)
 
 # In nim 1.6, `sink` + local variable + `move` generates the best code for
 # moving a proc parameter into a closure - this only works for closure
diff --git a/chronos/streams/boundstream.nim b/chronos/streams/boundstream.nim
index ce695719..8d2e52c5 100644
--- a/chronos/streams/boundstream.nim
+++ b/chronos/streams/boundstream.nim
@@ -18,8 +18,8 @@
 {.push raises: [].}
 
 import results
-import ../asyncloop, ../timer
-import asyncstream, ../transports/stream, ../transports/common
+import ../[asyncloop, timer, config]
+import asyncstream, ../transports/[stream, common]
 export asyncloop, asyncstream, stream, timer, common
 
 type
@@ -44,7 +44,7 @@ type
   BoundedStreamRW* = BoundedStreamReader | BoundedStreamWriter
 
 const
-  BoundedBufferSize* = 4096
+  BoundedBufferSize* = chronosStreamDefaultBufferSize
   BoundarySizeDefectMessage = "Boundary must not be empty array"
 
 template newBoundedStreamIncompleteError(): ref BoundedStreamError =
diff --git a/chronos/streams/chunkstream.nim b/chronos/streams/chunkstream.nim
index 77392076..f3e73e0c 100644
--- a/chronos/streams/chunkstream.nim
+++ b/chronos/streams/chunkstream.nim
@@ -11,13 +11,13 @@
 
 {.push raises: [].}
 
-import ../asyncloop, ../timer
-import asyncstream, ../transports/stream, ../transports/common
+import ../[asyncloop, timer, config]
+import asyncstream, ../transports/[stream, common]
 import results
 export asyncloop, asyncstream, stream, timer, common, results
 
 const
-  ChunkBufferSize = 4096
+  ChunkBufferSize = chronosStreamDefaultBufferSize
   MaxChunkHeaderSize = 1024
   ChunkHeaderValueSize = 8
     # This is limit for chunk size to 8 hexadecimal digits, so maximum
diff --git a/chronos/streams/tlsstream.nim b/chronos/streams/tlsstream.nim
index 12ea6d3c..6c019f11 100644
--- a/chronos/streams/tlsstream.nim
+++ b/chronos/streams/tlsstream.nim
@@ -16,9 +16,12 @@ import
   bearssl/[brssl, ec, errors, pem, rsa, ssl, x509],
   bearssl/certs/cacert
 import ".."/[asyncloop, asyncsync, config, timer]
-import asyncstream, ../transports/stream, ../transports/common
+import asyncstream, ../transports/[stream, common]
 export asyncloop, asyncsync, timer, asyncstream
 
+const
+  TLSSessionCacheBufferSize* = chronosTLSSessionCacheBufferSize
+
 type
   TLSStreamKind {.pure.} = enum
     Client, Server
@@ -777,11 +780,12 @@ proc init*(tt: typedesc[TLSCertificate],
     raiseTLSStreamProtocolError("Could not find any certificates")
   res
 
-proc init*(tt: typedesc[TLSSessionCache], size: int = 4096): TLSSessionCache =
+proc init*(tt: typedesc[TLSSessionCache],
+           size: int = TLSSessionCacheBufferSize): TLSSessionCache =
   ## Create new TLS session cache with size ``size``.
   ##
   ## One cached item is near 100 bytes size.
-  var rsize = min(size, 4096)
+  let rsize = min(size, 4096)
   var res = TLSSessionCache(storage: newSeq[byte](rsize))
   sslSessionCacheLruInit(addr res.context, addr res.storage[0], rsize)
   res