Tkinter window freezes / lags whenever the user inputs text to text field

Question

I am currently working on a server / client chat program which works fine on terminal but in trying to migrate it into a windowed program I've come across a few errors which I have managed to solve except for this one, for whatever reason, in the GUI class running on the main thread seems to lag considerably whenever the user focuses their attention on it or whenever they try to interact with it, I've tried to use threading but I'm not sure what the problem is.

...

class GUI():
    def __init__(self):
        self.txtval = []
        self.nochngtxtval = []
        self.root = tk.Tk()
        self.root.title("Chatroom")
        self.root.geometry("400x200")
        self.labl = tk.Label(self.root, text="", justify=tk.LEFT, anchor='nw', width=45, relief=tk.RIDGE, height=8)
        self.labl.pack()
        count = 1
        while events["connected"] == False:
            if events["FError"] == True:
                quit()
            self.labl["text"] = "Loading"+"."*count
            count += 1
            if count > 3:
                count = 1
        self.labl["text"] = ""
        self.inputtxt = tk.Text(self.root,height=1,width=40,undo=True)
        self.inputtxt.bind("<Return>", self.sendinput)
        self.sendButton = tk.Button(self.root, text="Send")
        self.sendButton.bind("<Button-1>", self.sendinput)
        self.sendButton.pack(padx=5,pady=5,side=tk.BOTTOM)
        self.inputtxt.pack(padx=5,pady=5,side=tk.BOTTOM)

        uc = Thread(target=self.updatechat,daemon=True)
        uc.start()

        self.root.protocol("WM_DELETE_WINDOW", cleanAndClose)
        self.root.mainloop()

    def updatechat(self):
        global events
        while True:
            if events["recv"] != None:
                try:
                    current = events["recv"]
                    events["recv"] = None
                    ... # shorten to reasonable length (45 characters)
                    self.labl['text'] = ''
                    self.txtval = []
                    self.nochngtxtval.append(new+"\n")
                    for i in range(len(nochngtxtval)):
                        self.txtval.append(nochngtxtval[i])
                    self.txtval.pop(len(self.txtval)-1) # probably not necessary
                    self.txtval.append(new+"\n") # probably not necessary
                    self.txtval[len(self.txtval)-1] = self.txtval[len(self.txtval)-1][:-1]
                    for i in range(len(self.txtval)):
                        self.labl['text'] = self.labl['text']+self.txtval[i]
                except Exception as e:
                    events["Error"] = str(e)
                    pass

    def sendinput(self, event):
        global events
        inp = self.inputtxt.get("1.0", "end").strip()
        events["send"] = inp
        self.inputtxt.delete('1.0', "end")

... # start the logger and server threads

GUI()

I'm using my custom encryption which is linked on github https://github.com/Nidhogg-Wyrmborn/BBR

my server is named server.py in the same git repo as my encryption.

EDIT:

I added a test file which is called WindowClasses.py to my git repo which has no socket interactions and works fine, however the problem seems to be introduced the moment i use socket as displayed in the Client GUI. I hope this can help to ascertain the issue.