diff --git a/common/netmessages.proto b/common/netmessages.proto
index 5295a467..45c880e9 100644
--- a/common/netmessages.proto
+++ b/common/netmessages.proto
@@ -48,6 +48,7 @@ enum SVC_Messages {
 	svc_Broadcast_Command = 74;
 	svc_HltvFixupOperatorStatus = 75;
 	svc_UserCmds = 76;
+	svc_NextMsgPredicted = 77;
 }
 
 enum VoiceDataFormat_t {
@@ -179,6 +180,8 @@ message CCLCMsg_RequestPause {
 }
 
 message CCLCMsg_CmdKeyValues {
+	option (maximum_size_bytes) = 1500;
+
 	optional bytes data = 1;
 }
 
@@ -240,6 +243,12 @@ message CMsgSource2NetworkFlowQuality {
 	optional uint32 enginemsgs_total = 20;
 	optional uint32 enginemsgs_sec_p95 = 21;
 	optional uint32 enginemsgs_sec_p99 = 22;
+	optional uint32 netframes_total = 30;
+	optional uint32 netframes_dropped = 31;
+	optional uint32 netframes_outoforder = 32;
+	optional uint32 netframes_size_exceeds_mtu = 34;
+	optional uint32 netframes_size_p95 = 35;
+	optional uint32 netframes_size_p99 = 36;
 	optional uint32 ticks_total = 40;
 	optional uint32 ticks_good = 41;
 	optional uint32 ticks_good_almost_late = 42;
@@ -260,6 +269,15 @@ message CMsgSource2NetworkFlowQuality {
 	optional sint32 recvmargin_p50 = 64;
 	optional sint32 recvmargin_p75 = 65;
 	optional sint32 recvmargin_p95 = 66;
+	optional uint32 netframe_jitter_p50 = 70;
+	optional uint32 netframe_jitter_p99 = 71;
+	optional uint32 interval_peakjitter_p50 = 72;
+	optional uint32 interval_peakjitter_p95 = 73;
+	optional uint32 packet_misdelivery_rate_p50_x4 = 74;
+	optional uint32 packet_misdelivery_rate_p95_x4 = 75;
+	optional uint32 net_ping_p5 = 80;
+	optional uint32 net_ping_p50 = 81;
+	optional uint32 net_ping_p95 = 82;
 }
 
 message CMsgSource2PerfIntervalSample {
@@ -277,6 +295,8 @@ message CMsgSource2PerfIntervalSample {
 }
 
 message CCLCMsg_Diagnostic {
+	option (maximum_size_bytes) = 16384;
+
 	optional .CMsgSource2SystemSpecs system_specs = 1;
 	optional .CMsgSource2VProfLiteReport vprof_report = 2;
 	optional .CMsgSource2NetworkFlowQuality downstream_flow = 3;
@@ -305,6 +325,8 @@ message CSource2Metrics_MatchPerfSummary_Notification {
 }
 
 message CSVCMsg_ServerInfo {
+	option (maximum_size_bytes) = 102400;
+
 	optional int32 protocol = 1;
 	optional int32 server_count = 2;
 	optional bool is_dedicated = 3;
@@ -458,6 +480,8 @@ message CSVCMsg_GameEventList {
 }
 
 message CSVCMsg_PacketEntities {
+	option (maximum_size_bytes) = 0;
+
 	message alternate_baseline_t {
 		optional int32 entity_index = 1;
 		optional int32 baseline_index = 2;
@@ -504,6 +528,8 @@ message CSVCMsg_TempEntities {
 }
 
 message CSVCMsg_CreateStringTable {
+	option (maximum_size_bytes) = 49152;
+
 	optional string name = 1;
 	optional int32 num_entries = 2;
 	optional bool user_data_fixed_size = 3;
@@ -517,6 +543,8 @@ message CSVCMsg_CreateStringTable {
 }
 
 message CSVCMsg_UpdateStringTable {
+	option (maximum_size_bytes) = 262144;
+
 	optional int32 table_id = 1;
 	optional int32 num_changed_entries = 2;
 	optional bytes string_data = 3;
@@ -615,6 +643,8 @@ message ProtoFlattenedSerializer_t {
 }
 
 message CSVCMsg_FlattenedSerializer {
+	option (maximum_size_bytes) = 0;
+
 	repeated .ProtoFlattenedSerializer_t serializers = 1;
 	repeated string symbols = 2;
 	repeated .ProtoFlattenedSerializerField_t fields = 3;
@@ -741,3 +771,8 @@ message CMsgServerUserCmd {
 message CSVCMsg_UserCommands {
 	repeated .CMsgServerUserCmd commands = 1;
 }
+
+message CSVCMsg_NextMsgPredicted {
+	optional int32 predicted_by_player_slot = 1 [default = -1];
+	optional uint32 message_type_id = 2;
+}
diff --git a/common/networkbasetypes.proto b/common/networkbasetypes.proto
index ed0cd4b7..07c0a6e7 100644
--- a/common/networkbasetypes.proto
+++ b/common/networkbasetypes.proto
@@ -1,5 +1,10 @@
+import "google/protobuf/descriptor.proto";
 import "network_connection.proto";
 
+extend .google.protobuf.MessageOptions {
+	optional int32 maximum_size_bytes = 50000;
+}
+
 enum SignonState_t {
 	SIGNONSTATE_NONE = 0;
 	SIGNONSTATE_CHALLENGE = 1;
@@ -124,6 +129,8 @@ message CNETMsg_StringCmd {
 }
 
 message CNETMsg_SetConVar {
+	option (maximum_size_bytes) = 4096;
+
 	optional .CMsg_CVars convars = 1;
 }
 
@@ -163,6 +170,8 @@ message CSVCMsgList_GameEvents {
 }
 
 message CNETMsg_SpawnGroup_Load {
+	option (maximum_size_bytes) = 131072;
+
 	optional string worldname = 1;
 	optional string entitylumpname = 2;
 	optional string entityfiltername = 3;
diff --git a/game/shared/base_gcmessages.proto b/game/shared/base_gcmessages.proto
index 02f453ae..2bfa6cb4 100644
--- a/game/shared/base_gcmessages.proto
+++ b/game/shared/base_gcmessages.proto
@@ -31,7 +31,7 @@ enum GC_BannedWordType {
 message CGCStorePurchaseInit_LineItem {
 	optional uint32 item_def_id = 1;
 	optional uint32 quantity = 2;
-	optional uint32 cost_in_local_currency = 3;
+	optional uint64 cost_in_local_currency = 3;
 	optional uint32 purchase_type = 4;
 	optional uint64 supplemental_data = 5;
 }
diff --git a/game/shared/cs/cs_gameevents.proto b/game/shared/cs/cs_gameevents.proto
index f9bddd6d..e2d18157 100644
--- a/game/shared/cs/cs_gameevents.proto
+++ b/game/shared/cs/cs_gameevents.proto
@@ -17,6 +17,17 @@ message CMsgTERadioIcon {
 }
 
 message CMsgTEFireBullets {
+	message Extra {
+		optional .CMsgQAngle aim_punch = 1;
+		optional int32 attack_tick_count = 2;
+		optional float attack_tick_frac = 3;
+		optional int32 render_tick_count = 4;
+		optional float render_tick_frac = 5;
+		optional float inaccuracy_move = 6;
+		optional float inaccuracy_air = 7;
+		optional int32 type = 8;
+	}
+
 	optional .CMsgVector origin = 1;
 	optional .CMsgQAngle angles = 2;
 	optional uint32 weapon_id = 3 [default = 16777215];
@@ -32,4 +43,5 @@ message CMsgTEFireBullets {
 	optional .CMsgVector ent_origin = 13;
 	optional uint32 num_bullets_remaining = 14;
 	optional uint32 attack_type = 15;
+	optional .CMsgTEFireBullets.Extra extra = 16;
 }
diff --git a/game/shared/cstrike15/cstrike15_usermessages.proto b/game/shared/cstrike15/cstrike15_usermessages.proto
index 32e7f5e5..2de6f97e 100644
--- a/game/shared/cstrike15/cstrike15_usermessages.proto
+++ b/game/shared/cstrike15/cstrike15_usermessages.proto
@@ -464,6 +464,8 @@ message CCSUsrMsg_SurvivalStats {
 }
 
 message CCSUsrMsg_EndOfMatchAllPlayersData {
+	option (maximum_size_bytes) = 4096;
+
 	message Accolade {
 		optional int32 eaccolade = 1;
 		optional float value = 2;
@@ -610,6 +612,8 @@ message CCSUsrMsg_RecurringMissionSchema {
 }
 
 message CCSUsrMsg_SendPlayerLoadout {
+	option (maximum_size_bytes) = 16384;
+
 	message LoadoutItem {
 		optional .CEconItemPreviewDataBlock econ_item = 1;
 		optional int32 team = 2;
diff --git a/game/shared/gameevents.proto b/game/shared/gameevents.proto
index 5dc61401..2f5c6e86 100644
--- a/game/shared/gameevents.proto
+++ b/game/shared/gameevents.proto
@@ -26,6 +26,7 @@ message CMsgPlaceDecalEvent {
 	optional .CMsgVector normal = 2;
 	optional .CMsgVector saxis = 3;
 	optional int32 boneindex = 4;
+	optional int32 triangleindex = 13;
 	optional uint32 flags = 5;
 	optional fixed32 color = 6;
 	optional int32 random_seed = 7;
@@ -50,6 +51,8 @@ message CMsgClearDecalsForEntityEvent {
 }
 
 message CMsgSource1LegacyGameEventList {
+	option (maximum_size_bytes) = 24576;
+
 	message key_t {
 		optional int32 type = 1;
 		optional string name = 2;
diff --git a/game/shared/usermessages.proto b/game/shared/usermessages.proto
index cea4ffb8..201f9d33 100644
--- a/game/shared/usermessages.proto
+++ b/game/shared/usermessages.proto
@@ -342,6 +342,8 @@ message CUserMessageCameraTransition {
 }
 
 message CUserMsg_ParticleManager {
+	option (maximum_size_bytes) = 4096;
+
 	message ReleaseParticleIndex {
 	}