# \[Solved\] Slow sync after 80%

**URL:** <https://forum.cardano.org/t/solved-slow-sync-after-80/78899>\
**Category:** Cardano Projects\
**Tags:** cardano\
**Created:** [10 October 2021 15:12 UTC](https://forum.cardano.org/t/solved-slow-sync-after-80/78899 "2021-10-10T15:12:35Z")\
**Posts on this page:** 5\
**Page:** 1

<div class="post-metadata">

**Author:** ![danaboy](https://avatars.discourse-cdn.com/v4/letter/d/f19dbf/32.png) [@danaboy](https://forum.cardano.org/u/danaboy)\
**Post date:** [10 October 2021 15:12 UTC](https://forum.cardano.org/t/solved-slow-sync-after-80/78899/1 "2021-10-10T15:12:35Z")

</div>

Hi my cardano node is slow to sync i have free ram and cpu and enough bandwidth

```auto
Every 2.0s: cardano-cli query tip --mainnet cardano: Sun Oct 10 15:11:28 2021

{
    "epoch": 237,
    "hash": "d44fbcac93b052468c27321b5f378fd68ab98ac09ccca137bbcac8806541439e",
    "slot": 17374987,
    "block": 5124999,
    "era": "Allegra",
    "syncProgress": "80.47"
}

```

my config like topology and … updated with this script

```auto

BLOCKPRODUCING_IP=0.0.0.0

BLOCKPRODUCING_PORT=3000

GENESIS_JSON="/home/cardano/cardano-node/config/mainnet-shelley-genesis.json"

NWMAGIC=$(jq -r .networkMagic < $GENESIS_JSON)

echo -n "Network Magic: ${NWMAGIC}\n"

blockNo=$(/home/cardano/.local/bin/cardano-cli query tip --mainnet | jq -r .block )

echo -n "Block NO: ${blockNo}\n"

wget -t 60 https://hydra.iohk.io/job/Cardano/cardano-node/cardano-deployment/latest-finished/download/1/mainnet-config.json -O ./config/mainnet-config.json

wget -t 60 -b https://hydra.iohk.io/job/Cardano/cardano-node/cardano-deployment/latest-finished/download/1/mainnet-byron-genesis.json -O ./config/mainnet-byron-genesis.json

wget -t 60 https://hydra.iohk.io/job/Cardano/cardano-node/cardano-deployment/latest-finished/download/1/mainnet-shelley-genesis.json -O ./config/mainnet-shelley-genesis.json

wget -t 60 https://hydra.iohk.io/job/Cardano/cardano-node/cardano-deployment/latest-finished/download/1/mainnet-alonzo-genesis.json -O ./config/mainnet-alonzo-genesis.json

wget -t 60 https://hydra.iohk.io/job/Cardano/cardano-node/cardano-deployment/latest-finished/download/1/rest-config.json -O ./config/rest-config.json

curl -s -o ./config/mainnet-topology.json "https://api.clio.one/htopology/v1/fetch/?hostname=0.0.0.0&port=3000&max=6&magic=${NWMAGIC}&customPeers=${BLOCKPRODUCING_IP}:${BLOCKPRODUCING_PORT}:1|relays-new.cardano-mainnet.iohk.io:3001:2"

```

---

<div class="post-metadata">

**Author:** ![Salem](https://avatars.discourse-cdn.com/v4/letter/s/8c91f0/32.png) [@Salem](https://forum.cardano.org/u/Salem)\
**Post date:** [10 October 2021 18:42 UTC](https://forum.cardano.org/t/solved-slow-sync-after-80/78899/2 "2021-10-10T18:42:23Z")

</div>

you are not the only person with this problem,but i had it 2 ,before updates 4.0.0 to 4.3.1 it was ok my sync i think cardano node is getting very heavy on software because of nft smartcontracts erc etc and what is stil to come to cardano blockchain,what i do now i sync every day to stay above 99.90% of sync it helps me out for the time now😎

---

<div class="post-metadata">

**Author:** ![danaboy](https://avatars.discourse-cdn.com/v4/letter/d/f19dbf/32.png) [@danaboy](https://forum.cardano.org/u/danaboy)\
**Post date:** [11 October 2021 08:08 UTC](https://forum.cardano.org/t/solved-slow-sync-after-80/78899/3 "2021-10-11T08:08:45Z")

</div>

why most be happend this issue my server have 16 gb real ram 12 gb swapp 6 core cpu and ssd hard and my topology file update every 1 H i cant understand this problem

also after one day my network growed to 95.25%

---

<div class="post-metadata">

**Author:** ![mcrio](https://sea1.discourse-cdn.com/flex023/user_avatar/forum.cardano.org/mcrio/32/40017_2.png) [@mcrio](https://forum.cardano.org/u/mcrio)\
**Post date:** [11 October 2021 08:24 UTC](https://forum.cardano.org/t/solved-slow-sync-after-80/78899/4 "2021-10-11T08:24:29Z")

</div>

For how many hours is it syncing already? It’s expected to get slower, as with time there were more blocks produced. I guess the % is based on the slot number, so in the beginning it’s fast because there was not that much data.

Btw you can configure your node to use more than 2 cores (IIRC that’s the default). Search for “RTS -N” or see discussion here: [How long does it take to sync a new cardano-node server running v1.29?](https://forum.cardano.org/t/how-long-does-it-take-to-sync-a-new-cardano-node-server-running-v1-29/75303)

---

<div class="post-metadata">

**Author:** ![danaboy](https://avatars.discourse-cdn.com/v4/letter/d/f19dbf/32.png) [@danaboy](https://forum.cardano.org/u/danaboy)\
**Post date:** [11 October 2021 09:13 UTC](https://forum.cardano.org/t/solved-slow-sync-after-80/78899/5 "2021-10-11T09:13:38Z")

</div>

that’s be amazing i added `+RTS -N4 --disable-delayed-os-memory-return -I0.3 -Iw600 -A16m -F1.5 -H5500M -T -S -RTS` parameters on my node runner script sync process is faster than IIRC

> _ **Important!** _ This parameter customized with my OS hardware don’t just copy/paste  
> [Guide for RTC](https://forum.cardano.org/t/solving-the-cardano-node-huge-memory-usage-done/67032)